JLT Oil Catch Can Separator Install and Review for 5th Gen 4Runner

JLT Oil Separator Install and Review for 5th Gen 4Runner

JLT Oil Separator and Catch Can – Complete Step By Step Install and Review

*** As of early 2022, JLT Performance is now call J&L Oil Separator Company. ***

What is the purpose of an Oil Separator you ask?

To understand what we need to understand why. When the engine goes through the suck, squeeze, bang, blow cycle process, that’s known as the “combustion cycle”. With this combustion cycle, combustion gasses, gas, and oil get passed over the piston rings and into the crankcase.

This phenomenon is known as “blow-by” or blow-by gases. Now the pressure will eventually build up in the crankcase from the blow-by, and eventually, this pressure will have to be vented somewhere and this is where the Positive Crankcase Ventilation (PCV) valve comes in.

The PCV valve vents the blow-by from the crankcase into the intake manifold to be fed back into the combustion chamber to be burned off. The PCV valve does this so that these blow-by gases don’t mix with the oil, causing sludge build-up and oil degradation over time. One of the problems with the PCV system is that the oil and unspent fuel will eventually build up in the intake valves and over time reduce engine efficiency. Basically, the PCV valve doesn’t catch everything. It’s designed to catch a lot of blow-by gasses but misses quite a bit over time.

This is where the JLT Oil Separator comes in.

Find It Online:

JLT Catch Can Install and Overview

JLT 3.0 Oil Separator

JLT Oil Separator for 5th Gen 4Runner

The JLT Oil Separator sits between the PCV valve and the intake manifold. It consists of two parts: the filter housing and the oil catch can.

JLT Oil Separator Features

  • 3oz capacity
  • Machined from billet aluminum
  • Multi-stage filter system
  • Made in the USA

The filter housing filters the blow-by from the PCV valve through a fine mesh stainless steel screen that traps the oil vapor so it condenses into tiny oil droplets and in turn gathers into a bigger droplet in an aluminum honeycomb filter below.

Once the droplets are large enough, it then falls into the oil catch can. Meanwhile, the gasses from the blow-by are passed back into the intake manifold without the sludge building oil and fuel.

What’s in the Box?

JLT Oil Separator What's Included for 5th Gen 4Runner

What’s Included

  • JLT Oil Separator (aka catch can)
  • Mounting bracket and M4 screws
  • PCV valve hose (Long)
  • Intake manifold hose (Short)

    Tools & Materials:

    Step 1. Remove Plastic Engine Cover

    Toyota 4Runner 4.0L Engine Cover

    Pretty simple start, lift up on the plastic engine cover and then pull it towards you.

    Step 2. Locate and Remove the PCV Hose

    5th Gen Toyota 4Runner PCV Hose

    With the cover removed, locate the PCV hose on the driver’s side of the engine. The PCV hose is connected to the intake manifold and the PCV valve on the valve cover. Locate the two spring clips at both ends of the hose and slide them towards the center of the hose. Once the spring clips are no longer clamping down on the connectors, gently pull and remove the hose from their connectors.

    5th Gen Toyota 4Runner PCV Hose on Driver Side Valve Cover

    The PCV valve on the valve cover is harder to get to, but if you follow the hose from the intake manifold side, it should be right there.

    Step 3. Install PCV Valve and Intake Manifold Hoses

    5th Gen 4Runner PCV Hose Removal

    Remove both spring clips from the PCV hose and transfer them to the short section of the PCV Valve Hose and Intake Manifold Hose.

    5th Gen 4Runner 4.0L PCV Hose Location

    Starting with the PCV Valve Hose (Long) route the hose from back to front and connect the short end of the hose to the PCV valve. I put blue painter’s tape on the PCV Valve Hose to make identifying the hoses easier. Then, lightly grease the intake manifold connector.

    Route the Intake Manifold Hose (short) from back to front and connect the short end of the hose to the intake manifold connector. I found the intake manifold connector was the more difficult one to insert, greasing the connector really helped.

    JLT Oil Separator PCV Hose Install for 5th Gen 4Runner

    The other end of the hoses should come out next to the oil cap.

    Step 4. Install JLT Oil Separator and Bracket

    JLT Oil Separator Bracket Install for 5th Gen 4Runner

    Using a 10mm extended socket and ratchet, remove the ball stud from the intake manifold.

    JLT Oil Separator Install and Lube for 5th Gen 4Runner

    Lightly grease the two connectors on the JLT Oil Separator

    JLT Oil Separator Hose to Intake and From PCV Install

    Connect the PCV Valve Hose to the “J” side of the Oil Separator.

    JLT Oil Separator Install Bracket for 5th Gen 4Runner

    Connect the Intake Manifold hose to the “T” side of the Oil Separator. Next, mount the Bracket to the JLT Oil Separator using the 2 M4 screws. And finally, using the previously removed ball stud, mount the Bracket onto the Intake Manifold. Do not fully tighten the ball stud.

    Step 5. Position JLT Oil Separator

    JLT Oil Separator Install for 5th Gen 4Runner

    Reinstall the engine cover and position the Oil Separator so the engine cover doesn’t excessively push down on the bracket and oil separator. Once you have the position figured out, check and make sure that the bracket isn’t hitting any hoses, and then tighten down on the ball stud by hand.

    The engine cover will rest on the top of the Oil Separator Bracket and according to JLT, this is normal.

    Final Thoughts

    5th Gen 4Runner Oil Catch Can Install on 4.0L

    Oil separators and catch cans in general are one of those modifications that don’t really have a downside. It will keep oil and unspent fuel out of your intake manifold and maintain engine efficiency. An oil separator is definitely a good modification to invest in if you plan on keeping your 4Runner for miles to come.

    Check back for an update after 3,000 miles to see how much oil has been accumulated.


    JLT Oil Catch Can Separator Install and Review for 5th Gen 4Runner

    @ +1,214 miles: The catch can collected 0.6 oz of oil/fuel.

    @ +2,005 miles: The catch can collected 1.1 oz of oil/fuel.

    @ +3,278 miles: The catch can collected 1.8 oz of oil/fuel.

    *Always recycle used motor oil accordingly.

    JLT Oil Catch Can Separator Install and Review for 5th Gen 4Runner

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    2 years ago

    I installed one a few months back. Didn’t expect it to fill up so fast. After remembering to check after two months it was full to the top. Checked it again after 3 weeks and it was already halfway full. Granted, I do put a lot of miles on.

    Angel Garcia
    Angel Garcia
    2 years ago

    I have just ordered mine. I do have a couple questions.
    1. How often do you check the catch can? 2. What do you do with the oil that is in the catch can when you empty it?


    2 years ago

    Seems like an answer to a problem no one is having.

    2 years ago

    The PCV system is there to help protect the environment. Using this system defeats that purpose. If you do use this system, please dispose of the waste responsibly.

    2 years ago
    Reply to  RayC

    Preach to China and India. Most Americans are responsible.

    2 years ago
    Reply to  Jensen

    The PCV system in and of itself is actually wasteful. It also degrades your engine over time. The purpose of the PCV system is to vent harmful vapors and waste materials and gases back into your intake manifold in order to be burned up in the combustion Chambers in a never-ending cycle. This actually increases carbon buildup in the engine and decreases fuel efficiency over time in direct injection engines.

    The reason they don’t put catch cans on engines these days is simply because the PCV system was simpler and more cost efficient. However, it causes your engine to have more buildup, faster, and lose fuel efficiency and operating efficiency over time. There are many benefits to putting on a catch can, and no downsides, as long as the oil collected is disposed of accordingly. But you have to understand, it’s far more than oil, it’s also carbon deposits and debris that are created by the combustion process in the engine that are fed back through the PCV system. So it’s more than oil you’re keeping from going back into your engine, and is a good idea overall.

    David M Williams
    David M Williams
    2 years ago

    I did a similar thing on an exotic engine and had “mayonnaise” build up on the lines, how are the lines doing on yours in that 3k, and build up on the tubes?

    Chris K
    Chris K
    2 years ago

    Thanks for posting, I bought one and can’t wait to install it. I’ve been debating getting one for a while.

    2 years ago

    Says they wont even ship to a CA address… bummer….

    2 years ago

    The only downside is that if you live in California this can cause you to fail smog due to tampering with the emissions system. That is the only reason I haven’t installed one on my 4runner

    Questions or Comments?x