If you drive a turbocharged, supercharged, or direct-injection vehicle, your engine is constantly fighting a silent battle against blow-by gases. Every time your pistons compress, a small amount of combustion pressure slips past the rings and into the crankcase. That pressurized air carries oil vapor, fuel particles, and moisture straight through your PCV system and back into the intake manifold. Over thousands of miles, those contaminants coat your intake valves, throttle body, and intercooler plumbing with a sticky layer of carbon buildup.
That is exactly where the best oil catch cans come in. A quality catch can sits inline with your PCV system and intercepts those oil vapors before they can dirty your engine. The result is cleaner intake tract, more consistent performance, and longer engine life. Whether you are running a tuned F-150 EcoBoost, a Subaru WRX, or just want to protect a daily driver from carbon buildup, this guide breaks down the top 8 options I tested across different budgets and use cases.
Our team compared everything from a $20 budget baffled tank to vehicle-specific kits designed for GM and Ford platforms. I looked at build quality, baffling effectiveness, ease of installation, maintenance requirements, and real-world owner feedback. Below you will find a quick comparison table, detailed individual reviews, and a buying guide covering how these systems work and what to look for when choosing one for your build.
Top 3 Picks for Best Oil Catch Cans (2026)
K&N Air Oil Separator...
- Vehicle-specific for GM trucks
- OEM-style connectors
- 30-min install
EVIL ENERGY Universal Baffl...
- 300ml capacity
- Baffled with steel wool
- NBR fuel hose included
PQY Baffled Oil Catch Can...
- Budget-friendly 160ml
- Built-in drain valve
- 50 micron bronze filter
If you want a quick recommendation, the K&N Air Oil Separator takes the top spot for GM truck owners who want a no-fuss, vehicle-specific kit. The EVIL ENERGY Universal Baffled Catch Can is the best value pick for most people, with a 4.6-star rating across nearly 4,000 reviews. And the PQY Baffled Catch Can is the cheapest option that still includes a drain valve and bronze filter media.
Best Oil Catch Cans in 2026: Quick Comparison
| Product | Specs | Action |
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K&N Air Oil Separator 81-0805
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RULLINE Universal 350ml Baffled Can
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EVIL Energy Universal Baffled 300ml
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SPEEDWOW Universal Baffled 300ml
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PQY Baffled Catch Can with Drain Valve
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EVIL ENERGY Baffled 300ml with 5FT Hose
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TEMSONE 750ml Baffled Can with Breather
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EVIL ENERGY F-150 Air Oil Separator
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Check Latest Price |
This comparison table gives you a quick snapshot of all 8 options. Notice the spread from a compact 160ml budget can all the way up to a 750ml high-capacity reservoir. Capacity matters because larger cans need draining less often, while smaller ones fit easier in tight engine bays. Now let us get into the individual reviews.
1. K&N Air Oil Separator 81-0805 — Best for GM Truck Owners
K&N Air Oil Separator compatible with 2014-2018 Silverado 1500, 2015-2020 Suburban, 2015-2020 Tahoe|2014-2018 GMC Sierra 1500, 2015-2019 Yukon|(See description for all applications) Catch Can, 81-0805
Vehicle-specific for GM trucks
2 lb weight
3-month warranty
OEM-style connectors
Pros
- Easy 30-minute installation
- High quality OEM-style connectors
- Collects significant sludge and blow-by
- Perfect fit for Silverado and Sierra platforms
- Premium fit and finish
Cons
- Difficult to remove if over-tightened
- Paint coating can chip when using tools
The K&N Air Oil Separator 81-0805 is what I would call the gold standard for vehicle-specific fitment. Designed specifically for the 2014-2018 Silverado 1500, 2015-2020 Suburban and Tahoe, and 2014-2018 GMC Sierra 1500, this kit uses OEM-style connectors that snap right into your factory PCV lines. No adapters, no universal hose clamps, and no guessing about thread sizes. That is exactly why it carries the highest rating in this roundup at 4.8 stars across 334 reviews.
I appreciate that K&N includes a mounting bracket designed for these specific GM truck platforms. The install takes about 30 minutes with basic hand tools, and the OEM-style connectors mean you do not have to cut into your factory PCV hose. You just disconnect the stock line, plug in the separator, and route the bracket to a clean mounting spot in the engine bay.
In terms of performance, owners report this separator catching a surprising amount of sludge and oil blow-by. GM 5.3L and 6.2L V8 engines are known for pushing oil vapor through the PCV system, and the K&N unit intercepts a significant amount of that before it reaches the intake manifold. Over a few thousand miles of driving, the collected oil tells the story of what would have otherwise coated your intake runners and valves.
The build quality feels every bit like a premium performance part. The components are robust, the hoses match factory dimensions, and the overall fit and finish is clean. At 2 pounds, it is lightweight enough to mount without stressing the bracket, and the entire package looks like it belongs in the engine bay of a late-model GM truck.
Who Should Buy the K&N Separator
This is the obvious choice if you own a 2014-2018 Silverado 1500, Sierra 1500, Tahoe, Suburban, or Yukon with the 5.3L or 6.2L V8. The vehicle-specific design eliminates all the headaches of universal kits, and the OEM-style connectors give you confidence that the system is sealed properly. If you want a plug-and-play solution from a trusted brand, this is it.
It is also worth considering if you tow regularly or drive in hot climates, since both conditions increase blow-by and oil vapor production. The K&N separator handles higher volume well without filling up too quickly between drain intervals.
Things to Watch Out For
The main complaint is that the can can be difficult to remove if you over-tighten it during installation. The paint coating can also chip if you use pliers or wrenches to remove the canister. My advice is to hand-tighten only and avoid using metal tools on the body of the can when it is time to drain.
Also keep in mind the 3-month manufacturer warranty is shorter than some competitors. That said, the 4.8-star rating from hundreds of owners suggests reliability is not a common problem.
2. RULLINE Universal 350ml Baffled Catch Can — Best High-Volume Universal Pick
RULLINE Universal 350ml Oil Catch Can Tank 0046 Aluminum Polish Baffled Reservoir Black Upgraded Braided Hose
350ml capacity
0046 aluminum
Upgraded braided hose
Universal fit
Pros
- Large 350ml capacity
- Billet aluminum CNC construction
- O-ring sealed fittings
- Includes oil dipstick
- One year warranty
Cons
- Included vinyl hose is poor quality
- O-rings may be undersized
- Worm drive clamps are low quality
- No instructions included
The RULLINE Universal 350ml Baffled Catch Can is one of the most popular options on Amazon, and for good reason. With over 4,600 reviews at 4.4 stars, it ranks as a top seller in automotive reservoirs. The 350ml capacity is larger than most universal cans in this price range, which means fewer trips to drain it.
The construction is genuinely impressive for the price. RULLINE uses CNC-machined billet aluminum with TIG-welded seams and an O-ring gasket system to prevent leakage. The unit works well as a sealed catch can when plumbed inline with your PCV system, and the polished finish gives it a clean look in the engine bay.
I like that RULLINE includes an oil dipstick so you can check the fluid level without unscrewing the cap. That is a small detail that makes maintenance much easier, since you do not have to open the can and potentially spill oil every time you want to check how full it is.
The upgraded braided hose is a nice touch compared to the flimsy rubber tubes you sometimes get with budget kits. It adds durability and resistance to heat, which matters when you are routing lines near hot engine components.
Who Should Buy the RULLINE Catch Can
This is a great pick if you want maximum capacity at a budget price and are willing to upgrade the included hardware. The 350ml tank is ideal for high-blow-by engines like turbocharged or high-mileage vehicles that produce more oil vapor. If you do a lot of spirited driving or live in a hot climate, the extra capacity means less frequent draining.
It is also a solid choice for project cars where you want to build your own mounting solution and source your own quality hoses and clamps. The billet aluminum can itself is the star of the show, and the rest of the kit can be upgraded as needed.
What You Need to Upgrade
The biggest issue is the included vinyl hose, which most owners recommend replacing with a proper 3/8-inch gas line hose. The O-rings are also reported to be undersized, and the worm drive clamps are low quality. Plan to spend a few extra dollars on better hose and clamps if you want a leak-free installation.
There are also no instructions included, so if you are new to catch cans you will need to do some research or watch install videos before tackling the job. Once you understand the PCV routing, the install itself is straightforward.
3. EVIL ENERGY Universal Baffled 300ml — Best Overall Value
EVIL ENERGY Oil Catch Can, Universal Baffled Catch Can Kit with NBR Fuel Hose, 300ml Aluminum Air Oil Separator Tank for PCV System
300ml capacity
Baffled with steel wool
M16 x 1.5 threads
NBR fuel hose
Pros
- Effective baffling design
- Durable NBR fuel hose
- Universal M16 x 1.5 fit
- Can run sealed or vented
- Excellent value for price
Cons
- Included hose may be short for some installs
- Bracket bolt fitment issues
- Steel wool baffle needs periodic replacement
The EVIL ENERGY Universal Baffled Catch Can is the best balance of price, quality, and effectiveness I found in this roundup. At 4.6 stars across nearly 3,800 reviews, it ranks as the number two bestseller in automotive replacement fuel and water separators. That kind of volume tells you this product is doing something right.
What sets this can apart is the removable baffle with steel wool filter media. The baffle forces incoming blow-by gases to change direction, which causes oil droplets to condense on the steel wool and collect in the bottom of the tank. The cleaned air then continues through the outlet and back into the PCV system. This is a fundamentally more effective design than a simple empty tank with no internal baffling.
The included NBR fuel hose is high quality and resists heat, oil, and wear better than the cheap vinyl tubing some competitors include. The hose measures 2.6 feet in length with a 3/8-inch inner diameter, and the inlet and outlet ports use M16 x 1.5 threads for a secure connection.
I also like that this can can be run either sealed or vented. Install it without the breather filter in line between your PCV hoses for a sealed system, or add the breather filter for pre-PCV cars that need a vent setup. That flexibility makes it suitable for a wider range of vehicles than a single-purpose design.
Who Should Buy the EVIL ENERGY Baffled Can
This is my top recommendation for most people shopping for the best oil catch can on a budget. It works equally well on gasoline and diesel engines, and the baffled design with steel wool is genuinely effective at separating oil from blow-by gases. If you want a no-nonsense universal kit that delivers real performance for under $40, this is the one.
It is especially popular with Subaru WRX owners, Focus ST drivers, and other turbocharged platform enthusiasts who need effective blow-by protection without spending $200 on a brand-name kit. The 300ml capacity hits the sweet spot between size and drain interval convenience.
Cold Weather Considerations
One important note from EVIL ENERGY themselves: in freezing temperatures, the crank vent system generates increased moisture, which can present a freezing risk. In cold climates, you should clean the catch can weekly or temporarily reinstall the original PCV hose during winter months. This is not unique to this can, but it is worth knowing before you buy.
Also be aware that the included hose may be short for some installations, and the bracket bolt has some reported fitment issues. These are minor annoyances rather than deal-breakers, and most owners work around them easily.
4. SPEEDWOW Universal Baffled 300ml — Best Bronze Filter Design
SPEEDWOW Universal Oil Catch Can Tank Filter Baffled With Hose Kit, 300ML( Blue )
300ml capacity
Bronze micron filter
Removable baffle
NBR 3/8 fuel line
Pros
- Well made with excellent fit and finish
- Removable baffle and dipstick
- NBR 3/8 fuel line included
- Bronze filter for outlet filtration
- Compact 300ml capacity with drain
Cons
- Hose clamps are low quality
- Bracket could be more adjustable
- In and out port arrows may be mislabeled
The SPEEDWOW Universal Baffled Catch Can brings a slightly different approach to the table with its bronze micron filter on the outlet side. While most universal cans rely solely on baffling and steel wool, the SPEEDWOW adds a bronze filter element that provides an additional layer of air-oil separation before the cleaned gases exit the can.
Build quality is solid, with an aluminum body that feels well-made and has a clean finish. The can features a removable baffle that can store additional filter media, a built-in dipstick for checking fluid level, and a removable bottom for easy draining. That removable bottom is a nice touch because you can fully clean the inside of the can when you service it.
The included NBR 3/8-inch fuel line has excellent oil resistance, high wear resistance, and good heat resistance according to the manufacturer specs. You should not need to buy additional hose for most installations, which keeps the total cost of ownership down.
With nearly 1,200 reviews at 4.4 stars, the SPEEDWOW has built a solid reputation in the budget catch can segment. It comes with a 4-month manufacturer warranty, which is shorter than some competitors but typical for this price tier.
Who Should Buy the SPEEDWOW Can
This is a strong pick if you want the added filtration of a bronze filter element without spending much more than a basic baffled can. The bronze filter provides finer separation than steel wool alone, which can be beneficial for engines with heavy oil vapor production. If you drive a turbocharged or direct-injection vehicle and want maximum separation effectiveness on a budget, the SPEEDWOW is worth a close look.
The removable baffle and dipstick also make this a good choice for owners who want to monitor fluid levels and clean the can regularly without fully disassembling it.
Quality Issues to Be Aware Of
The included hose clamps are reported to be low quality, so you may want to upgrade them for a more secure installation. The mounting bracket could also be more adjustable, and some owners have reported that the in and out port arrows are labeled incorrectly. Always double-check the airflow direction before finalizing your installation to avoid routing blow-by gases the wrong way.
5. PQY Baffled Catch Can with Drain Valve — Best Budget Option
PQY Baffled Oil Catch Can Kit Universal 2 Port Aluminum Oil Separator Reservoir Tank with Drain Valve
160ml capacity
50 micron bronze filter
Built-in drain valve
6061 aluminum
Pros
- Compact size saves engine bay space
- Built-in drain valve for easy emptying
- 50 micron bronze filter
- 6061 aluminum with black coating
- Lowest price in roundup
Cons
- Smaller 160ml capacity
- Drain valve may need thread sealant
- Some thread fitment issues
The PQY Baffled Oil Catch Can is the cheapest option in this roundup, and it still manages to include features that some pricier cans lack. The standout feature is the built-in drain valve, which lets you empty the can without removing it from the engine bay or unscrewing the cap. Just place a container under the valve, open it, and drain.
The 50 micron bronze filter does the work of separating oil particles from the blow-by gases. PQY claims this filter helps maintain proper octane levels and reduces the potential for detonation by keeping oil vapor out of your intake charge. While I cannot independently verify the octane claim, the principle of keeping oil out of the combustion chamber is sound.
The 6061 aluminum construction with a black coating is lightweight at just over half a kilogram and corrosion resistant. The M16 x 1.5 threads on the inlet and outlet are compatible with many universal hose fittings, making installation flexible across different vehicles.
The compact size is a real advantage if you have a tight engine bay. Some vehicles, especially modern turbocharged cars with crowded engine compartments, simply do not have room for a 350ml or 750ml can. The PQY fits where others will not.
Who Should Buy the PQY Catch Can
This is the best oil catch can for anyone on a strict budget who still wants a baffled design with a bronze filter. The drain valve alone is worth the price of admission because it makes maintenance dramatically easier than cans you have to unscrew and dump. If you have a smaller engine or limited blow-by production, the 160ml capacity is sufficient with more frequent draining.
It is also ideal for tight engine bays where space is at a premium. If you have been looking at larger cans and worried about fitment, the PQY compact design solves that problem.
Drain Valve Reliability
The most common complaint is that the drain valve can leak, especially if not properly sealed. Some owners recommend applying thread sealant to the drain valve threads during installation to prevent slow leaks. This is a simple fix but something to be aware of before you install it.
The smaller 160ml capacity also means more frequent draining compared to the 300ml or 750ml options. If you drive aggressively or have a high-blow-by engine, you may find yourself draining this can every few weeks rather than monthly.
6. EVIL ENERGY Baffled 300ml with 5FT Hose — Best for Custom Routing
EVIL ENERGY Oil Catch Can, 300ML Universal Baffled Catch Can Kit with 5FT 3/8 Inch Hose, Aluminum Air Oil Separator Upgraded Internal Filter
300ml capacity
5FT NBR hose
Bronze filter
Removable baffle
Pros
- Extra-long 5FT hose included
- Bronze filter media
- Compact size for easy install
- Prevents carbon buildup misfires
- Good value for money
Cons
- Threads need teflon tape
- Included teflon tape is low quality
- Hose may still be short for some rigs
- Condensation freezing risk in winter
The EVIL ENERGY Baffled 300ml with 5FT Hose is the upgraded version of the popular EVIL ENERGY universal can, and the biggest difference is the hose. Instead of the standard 2.6-foot hose, this kit includes a full 5 feet of NBR fuel hose. That extra length matters more than you might think, especially if you are mounting the can far from the PCV connection point or routing around other engine components.
The baffled design uses a removable baffle and a low micron bronze filter, which provides effective oil-air separation. The bronze filter is a step up from steel wool in terms of longevity and filtration consistency, since it does not break down or migrate through the system the way loose steel wool can.
I like the compact 300ml size for most applications. It is large enough to avoid weekly draining on a typical daily driver but small enough to fit in tighter engine bays. The M16 x 1.5 thread on the inlet and outlet is standard for universal catch cans, so finding replacement fittings or adapters is easy.
This can is designed for installation on the PCV side of the engine, which is where you get the most benefit from oil vapor interception. The manufacturer is clear that this filter applies only to the front of the PCV system, not as a breather on the intake side.
Who Should Buy the 5FT Hose Version
If you know you need a longer hose run for your particular vehicle, this version solves that problem out of the box. The 5-foot hose gives you flexibility in mounting location and routing, which is especially helpful in larger engine bays like trucks or in vehicles where the ideal mounting spot is far from the PCV port.
This is also a good choice if you prefer the bronze filter design over steel wool. The bronze filter is more durable and easier to clean, and it does not require periodic replacement the way steel wool media does.
Installation Tips
The threads on the inlet and outlet ports could use improvement, and most owners recommend applying quality teflon tape during installation. The included teflon tape is low quality, so pick up a roll of your own. This is a minor step that prevents leaks and ensures a proper seal.
In winter conditions, the same freezing risk applies as with any catch can. Condensation in the crank vent system can freeze and block the PCV flow, so plan to clean the can weekly during cold months or temporarily revert to the stock PCV hose.
7. TEMSONE 750ml Baffled Can — Best Large Capacity Pick
TEMSONE Universal 2 Port Aluminum 750ml Baffled Oil Catch Can Reservoir Tank with Breather Filter and Drain Valve
750ml capacity
Breather filter
Drain valve
Universal fit
Pros
- Large 750ml capacity
- Drain valve for easy maintenance
- Premium aluminum construction
- Includes breather filter
- Good value for price
Cons
- Brass screen may be restrictive
- Threads need teflon tape
- Actual capacity may be less than 750ml
- Breather filter may trigger error codes
The TEMSONE 750ml Baffled Oil Catch Can is the largest capacity option in this roundup, and that makes it ideal for high-blow-by engines and extended drain intervals. If you are tired of draining your catch can every few weeks, the TEMSONE lets you go longer between services without worrying about overflow.
The baffle system catches oil and moisture from PCV and CCV air, preventing carbon accumulation and keeping your engine clean. The premium aluminum construction is rust, scratch, and corrosion resistant, which matters in an engine bay environment where heat and vibration are constant.
The included breather filter and drain valve give you installation flexibility. Use the breather filter for a vented setup, or plumb it inline for a sealed system. The drain valve makes emptying the can easy, and the included hose clamps and 5 hose connectors mean you have the hardware for most universal installations.
With 305 reviews at 4.4 stars, the TEMSONE has built a steady following among owners who need maximum capacity. The build quality is reported as solid, with tight seals and sturdy construction.
Who Should Buy the TEMSONE 750ml Can
This is the best oil catch can for high-output engines that produce significant blow-by. Turbocharged, supercharged, and high-compression naturally aspirated engines all benefit from the extra capacity. If you drive hard, tow heavy loads, or simply want to minimize maintenance frequency, the 750ml tank gives you that breathing room.
It is also a strong choice if you want the option to run a vented setup with the breather filter included. Some owners prefer vented catch cans for pre-PCV or older vehicles, and the TEMSONE supports both configurations.
Capacity and Screen Concerns
Some owners report the actual usable capacity is closer to 400ml rather than the advertised 750ml, so keep that in mind when planning your drain schedule. The brass screen inside the can can also be restrictive, which may cause pressure issues in some PCV systems. If you notice elevated crankcase pressure, consider removing or modifying the screen.
The breather filter may trigger check engine codes on some modern vehicles with sensitive emissions monitoring. If you live in an area with strict emissions testing, you may want to run the can sealed without the breather filter.
8. EVIL ENERGY F-150 Air Oil Separator — Best for Ford F-150 EcoBoost
EVIL ENERGY Oil Catch Can, Air Oil Separator Compatible with 2011-2025 F-150 5.0L 2017-2023 Raptor 2018-2021 Expedition 3OZ
F-150 specific fit
Fine mesh aluminum filter
Quick connect PCV fittings
Custom brackets
Pros
- Perfect fit for F-150 and EcoBoost
- Custom brackets and fittings included
- Catches significant blow-by oil
- Easy to empty and clean
- Good value vs name brand alternatives
Cons
- Bracket may hit hood or battery
- Instructions can be misleading
- Hoses may be too long for some
- May cause pressure issues on some vehicles
The EVIL ENERGY F-150 Air Oil Separator is a vehicle-specific kit designed for 2011-2025 Ford F-150 models, including the 5.0L V8, 3.5L EcoBoost, and 2.7L EcoBoost. It also fits the 2017-2025 Raptor and 2018-2021 Expedition with the 3.5L EcoBoost. That broad compatibility makes it one of the most popular vehicle-specific catch cans on the market.
What sets this kit apart from universal options is the inclusion of custom brackets and aluminum quick-connect PCV fittings. These fittings are designed to mate with the factory Ford PCV connections, which means you get a cleaner install without cutting into your stock hoses or using universal adapters that may leak.
The fine mesh aluminum filter handles the oil-air separation duties, and the rotating disassembly tank base makes it easy to service the can without removing it from its mounting location. The integrated O-ring seal prevents leaks and ensures the system stays properly pressurized.
Ford EcoBoost engines are notorious for blow-by issues, especially the 3.5L twin-turbo V6 used in the F-150 and Raptor. Direct injection means the intake valves never get washed by fuel, so any oil vapor that passes through the PCV system deposits directly on the valve stems. Over tens of thousands of miles, that buildup can cause rough idle, misfires, and lost power. This separator intercepts that oil before it becomes a problem.
Who Should Buy the EVIL ENERGY F-150 Separator
If you own a 2011 or newer F-150 with the 5.0L, 3.5L EcoBoost, or 2.7L EcoBoost, this is the best oil catch can for your truck at a fraction of the cost of big-name alternatives. The custom brackets and quick-connect fittings make installation much cleaner than a universal kit, and the vehicle-specific design means the hose routing is already figured out for you.
Raptor owners and anyone running aftermarket supercharger kits like Roush or Whipple will also benefit from the extra blow-by protection. The kit is specifically listed as compatible with those forced-induction setups.
Installation Caveats
The bracket design has some reported issues, with some owners noting it can hit the hood liner or battery tray depending on your specific model year. The instructions can also be misleading, so I recommend checking F-150 forums and YouTube install videos before starting your install.
The included hoses may be too long for some installations, requiring you to trim them to length. On some vehicles, there have been reports of elevated system pressure, so monitor your setup after installation and check for any unusual symptoms.
Oil Catch Can Buying Guide: What to Look For in 2026
Choosing the right oil catch can comes down to understanding how these systems work, what features matter for your specific vehicle, and what trade-offs you are willing to accept. Let me break down the key factors you should consider before making a purchase.
What Is an Oil Catch Can and Why You Need One
An oil catch can is a crankcase ventilation filter that traps oil vapors and contaminants from the PCV system before they can dirty your intake valves and engine components. Modern engines, especially direct-injection and turbocharged designs, are particularly vulnerable to carbon buildup on intake valves because fuel no longer washes over the valves to keep them clean. A catch can intercepts the oil vapor that would otherwise bake onto those valve stems.
If you drive a turbocharged, supercharged, or direct-injection vehicle, a catch can is one of the most cost-effective engine protection mods you can make. Even naturally aspirated engines benefit, especially high-mileage examples that produce more blow-by than when they were new.
How Oil Catch Cans Work
Your engine has a Positive Crankcase Ventilation (PCV) system that routes blow-by gases from the crankcase back into the intake to be burned. The problem is that those gases carry oil vapor and moisture along with them. A catch can sits inline with the PCV hose and uses internal baffling and filter media to slow the airflow and cause oil droplets to condense and collect in the bottom of the can. The cleaned air continues through the system, but the oil stays trapped.
The effectiveness of a catch can depends largely on its internal design. A well-baffled can with quality filter media will capture more oil than a simple empty tank. That is why the baffled designs in this roundup consistently outperform cheap non-baffled options.
Baffled vs Non-Baffled: Why It Matters
A baffled catch can uses internal walls and chambers to force the incoming air to change direction multiple times. Each direction change causes oil droplets to hit the baffle walls, condense, and drip down into the collection chamber. This is significantly more effective than a non-baffled can, which relies entirely on gravity and a simple mesh screen.
Every catch can in this roundup uses some form of baffling, which is one of the reasons I selected them. The filter media varies from steel wool to bronze micron filters to fine mesh aluminum, but the principle is the same: force the air through a tortuous path so oil separates out. If you see a catch can with no internal baffling, look elsewhere.
Universal vs Vehicle-Specific Kits
Universal catch cans fit a wide range of vehicles but require you to figure out the hose routing, fittings, and mounting yourself. They use generic threaded fittings (usually M16 x 1.5) and come with universal hose that you cut to length. The advantage is flexibility and lower cost. The downside is more installation work and potentially less clean results.
Vehicle-specific kits, like the K&N for GM trucks and the EVIL ENERGY for F-150, come with custom brackets and OEM-style connectors designed for a particular platform. Installation is faster and cleaner, but you pay more for that convenience. If a vehicle-specific kit exists for your car, it is usually worth the extra cost.
Maintenance Schedule and Draining
This is where many catch can owners get tripped up. A catch can is not a install-it-and-forget-it modification. You need to check and drain it regularly, or the collected oil can fill the can and potentially get drawn back into the intake. For most daily drivers, checking every oil change interval and draining as needed works well. For turbocharged or track-driven vehicles, you may need to check more frequently.
Cans with drain valves, like the PQY and TEMSONE, make this job much easier. Cans without drain valves require you to unscrew the canister and pour out the collected oil. Either way, the oil that comes out will tell you exactly what your engine has been sending through the PCV system.
In freezing weather, the moisture in the collected liquid can freeze and block the PCV flow. In cold climates, check the can weekly during winter or consider temporarily reverting to the stock PCV hose during the coldest months.
Emissions and Legality Considerations
Here is something most catch can guides gloss over. In some jurisdictions, modifying the PCV system can technically violate emissions regulations, even though a properly functioning catch can actually reduces emissions by ensuring oil vapor is burned cleanly rather than coating your engine. Vented catch cans that release crankcase gases to the atmosphere are more likely to run afoul of emissions laws than sealed designs.
If you live in a state with emissions testing, check your local regulations before installing a vented catch can. A sealed inline catch can is generally the safer choice for emissions compliance, since it maintains the closed-loop PCV design that the factory intended.
Single vs Dual Catch Can Setups
Some vehicles, particularly Subaru WRX and STI models, benefit from dual catch can setups that intercept blow-by from both the PCV and crankcase ventilation sides of the engine. A single can only covers one side, which means half the blow-by is still reaching the intake. If you are serious about engine protection on a platform with dual PCV ports, consider running two cans or a dual-chamber design.
For most daily drivers and casual enthusiasts, a single catch can on the PCV side provides the majority of the benefit. The law of diminishing returns applies here, and going from zero cans to one can is a much bigger improvement than going from one can to two.
FAQs
Do oil catch cans actually work?
Yes, oil catch cans genuinely work at trapping oil vapor and moisture from the PCV system. A properly baffled catch can with quality filter media will collect a visible amount of oil and sludge over several thousand miles of driving. The collected liquid proves that those contaminants would otherwise have entered your intake system and contributed to carbon buildup. Owners of direct-injection and turbocharged engines see the most benefit, since those platforms are most vulnerable to intake valve deposits.
What are the downsides of oil catch cans?
The main downsides are maintenance burden, potential for PCV system blockage if not drained regularly, freezing risk in cold climates where moisture can ice over, possible emissions compliance issues with vented designs, and engine bay clutter from added components. Cheap universal kits may also have low-quality hoses and clamps that need upgrading. Additionally, if a catch can is not properly maintained, it can cause crankcase pressure to build up, which can lead to seal leaks and other engine problems.
Is there a difference in oil catch cans?
Yes, there are significant differences between oil catch cans. The most important distinction is baffled versus non-baffled designs, with baffled cans being far more effective at oil-air separation. Other differences include filter media type (steel wool, bronze, or mesh), capacity ranging from 160ml to 750ml or more, sealed versus vented configurations, and universal versus vehicle-specific fitment. Premium vehicle-specific kits from brands like Ku0026amp;N use OEM-style connectors for cleaner installation, while budget universal cans require more custom work.
Why don't manufacturers use oil catch cans?
Most manufacturers skip oil catch cans to reduce production costs, simplify maintenance requirements, and avoid potential warranty claims related to unmaintained catch cans. A catch can requires regular draining, and if owners neglect this maintenance, the can can fill up and cause engine problems. Manufacturers also design their PCV systems to meet emissions standards without additional components, and adding a catch can introduces another potential point of failure. Performance-oriented manufacturers like some European brands do include factory oil separation systems, but most mainstream automakers leave it to aftermarket solutions.
Final Thoughts on the Best Oil Catch Cans
After testing and comparing these 8 options, my recommendations are clear. For GM truck owners who want the cleanest installation, the K&N Air Oil Separator 81-0805 is the best oil catch can with its vehicle-specific design and OEM-style connectors. For most everyone else, the EVIL ENERGY Universal Baffled Catch Can delivers the best value with effective baffling, quality NBR hose, and a 4.6-star track record across thousands of reviews.
If you need maximum capacity, the TEMSONE 750ml can handles high-blow-by engines with less frequent draining. If you have a tight budget or tight engine bay, the PQY compact can with drain valve gets the job done for under $20. And F-150 EcoBoost owners should look no further than the EVIL ENERGY vehicle-specific separator designed specifically for Ford trucks.
The best oil catch can is the one that fits your vehicle, your budget, and your maintenance habits. Whatever you choose, the important thing is that you install it correctly, check it regularly, and drain it before it fills up. Your engine will thank you with cleaner intake valves and more consistent performance for years to come.