Oil Catch Can for 2016-2023 Toyota Tacoma 3.5L Guide

An oil catch can for the 2016-2023 Toyota Tacoma 3.5L is an inline air/oil separator that traps oily PCV blow-by vapor before it recirculates into your intake, keeping the throttle body, intake manifold, and valves cleaner over the life of the truck. On the 3.5L V6 — Toyota's 278-horsepower, 265 lb-ft 2GR-FKS — a catch can is not a mandatory repair, but it is cheap, reversible insurance that a lot of high-mileage and towing owners install. In this guide we break down what a catch can actually does on this specific engine, review the K&N 81-0813 we stock at our Tampa, FL shop, compare it to the other direct-fit option, and walk through install and maintenance.

What Is an Oil Catch Can, and What Does It Do on the Tacoma 3.5L?

An oil catch can is a small canister plumbed into your engine's crankcase-ventilation line that condenses and traps oil mist and moisture before that vapor is pulled back into the intake. Every modern engine, including the Tacoma's 2GR-FKS, uses a Positive Crankcase Ventilation (PCV) system. During combustion a small amount of pressurized gas and oil mist slips past the piston rings into the crankcase — this is called blow-by. Rather than vent those fumes to the atmosphere, the PCV system routes them back into the intake to be re-burned, which is required for emissions compliance.

The catch is in the name: those recirculated vapors carry oil mist, fuel, and water condensation, and over tens of thousands of miles they coat the intake tract, throttle body, and intake-manifold runners with an oily film. A catch can sits inline on that PCV line and uses internal baffles to drop the oil and moisture into a reservoir, letting cleaner air continue to the intake. On the K&N 81-0813, that reservoir holds 6 ounces — larger than the 3-to-4-ounce cans many competitors ship — so you drain it less often.

Does the 2016-2023 Tacoma 3.5L (2GR-FKS) Actually Need a Catch Can?

No — the 2016-2023 Tacoma 3.5L does not strictly need a catch can, and we will be straight with you about why. The 2GR-FKS uses Toyota's D-4S dual-injection system, which combines both direct injection and port injection. At idle and light load the port injectors spray fuel across the back of the intake valves, and that fuel continuously washes and detergent-cleans the valve faces. Toyota engineered D-4S specifically to solve the intake-valve carbon buildup that plagues pure direct-injection engines from VW, Audi, BMW, and others.

That means the "your valves will coke up without a catch can" scare you see on forums is overstated for this truck. What a catch can genuinely does on the 2GR-FKS is keep oil out of the intake tract, throttle body, and manifold runners, and reduce the oil that reaches the combustion chamber during direct-injection-only phases like cold starts and hard acceleration. It is best thought of as long-term cleanliness insurance, not a fix for a known failure. One more honest note: because this Tacoma is naturally aspirated, the anti-knock and effective-octane benefits that make catch cans popular on boosted engines mostly do not apply here. If you tow heavy, drive high mileage, or simply want to keep everything downstream of the PCV valve spotless, the K&N is worth it. If you keep trucks short-term and stay bone stock, it is optional.

K&N 81-0813 Air/Oil Separator: Our Review

The K&N 81-0813 is a vehicle-specific, closed-loop air/oil separator built exclusively for the 2016-2023 Tacoma 3.5L. Unlike a generic universal can that forces you to source your own brackets and cut hoses, this kit replaces the factory crankcase line and uses OEM-style snap connectors so it plugs into the stock PCV routing. The canister is machined aluminum measuring 2.5 inches in diameter by 4.5 inches tall, and it stays a fully sealed loop — it does not vent to atmosphere — so it keeps the truck emissions-plumbing intact.

In the box you get the separator, a mounting bracket, two 3/8-inch ID hoses (one 12-inch and one 17-inch), and the button-head screws and lock washers to mount it. K&N rates the install at about 30 minutes with basic hand tools, and draining is genuinely tool-free — you check and empty the reservoir by hand. The whole unit is backed by K&N's No-Hassle Lifetime Limited Warranty, which is a meaningful edge over the 1-year coverage typical of budget cans.

How Does the K&N Compare to Other Tacoma 3.5L Catch Cans?

The K&N 81-0813 and the J&L 3.0 are the two direct-fit separators built specifically for the 2016-2023 Tacoma 3.5L. The K&N is the one we keep in stock; the J&L is a driver-side machined-aluminum unit that is currently out of stock. Beyond these two, enthusiast brands like Radium Engineering (which offers PCV, CCV, and dual-can kits with larger 7-8 oz cans and a serviceable dipstick), UPR Products, and Mishimoto make quality universal and vehicle-specific options, but they command higher prices and are not always direct plug-and-play. For a factory-style, closed-loop install at the best price, the K&N is our pick.

How Do You Install the K&N Catch Can on a Tacoma?

Installing the K&N 81-0813 is a beginner-friendly bolt-on that takes about 30 minutes with hand tools — no cutting or drilling. You will need a 2.5mm Allen key, a ratchet, a 12mm socket, a 13/16-inch wrench, and Teflon tape. Here is the sequence straight from K&N's instruction sheet:

1. Verify the kit contents — separator, bracket, two 3/8-inch hoses, two button-head screws, two split lock washers.
2. Remove the factory PCV line at the intake manifold and the rear of the engine by pinching the clamp and sliding it off.
3. Assemble the quick-disconnect fittings to the top of the separator using Teflon tape. Do not over-tighten.
4. Bolt the bracket to the intake manifold using an existing M8 bolt.
5. Mount the canister to the bracket with the two button-head screws and lock washers.
6. Connect the hoses — the passenger-side hose to the rear of the engine, the driver-side hose to the intake manifold — using the stock hose clamps. Lightly oil the O-ring so the fittings seat easily.

Because it reconnects factory-style into the PCV loop, the install is fully reversible — you can return the truck to stock in minutes if you ever need to. If you would rather not do it yourself, our team in Tampa installs catch cans in about a half hour.

How Often Should You Drain the Catch Can?

K&N officially recommends checking the separator every 10,000 miles or 12 months, and sooner under harsh use like heavy towing or off-road driving. That said, many Tacoma owners drain it at every oil change (roughly every 5,000 miles) simply because it is quick and tool-free. Plan to check it more often in the first few thousand miles so you can learn how fast your truck fills the reservoir based on your climate and driving.

One climate-specific caution: in below-freezing temperatures the water and condensation a catch can collects can freeze in the line between the can and the manifold, which can cause a blockage. If you run your Tacoma in hard winters, check the can more frequently and empty it before long cold soaks. Expect a meaningful share of what you drain to be water and fuel condensation rather than pure oil, especially on this naturally aspirated engine and on short-trip driving — that is normal, not a defect.

Is a Catch Can Legal, and Will It Void My Warranty?

The K&N 81-0813 is not CARB-certified and carries no EO number, so it is not legal for sale or use in California or other states that adopt CARB emissions standards, and it ships with a Prop 65 warning. It is street-legal in the rest of the United States. If you live in California, this specific part will not pass a visual emissions inspection — that is the single biggest reason to skip it.

On the warranty question, installing a catch can does not automatically void your Toyota factory warranty. Under the federal Magnuson-Moss Warranty Act, a dealer cannot blanket-deny your warranty just because you added an aftermarket part — they must prove that the part actually caused the specific failure being claimed. Because the K&N reconnects into the factory PCV loop as a closed system and is fully reversible, it is low-risk from a warranty standpoint. Keep your receipt and the factory line, and you can return to stock for any dealer visit.

Pair It With the Right Intake

A catch can keeps oil out of your intake tract, so it pairs naturally with an airflow upgrade. If you are refreshing the top end of your 2016-2020 Tacoma 3.5L, the Injen Evolution Cold Air Intake ($393.55) is a popular match, drawing cooler air through an 8-layer cotton-gauze filter. Browse the full intake collection or the broader engine parts collection to build out your setup.