J&L Oil Separator For 3rd Gen Tundra – Review

J&L Air Oil Separator For 3rd Gen Tundra

Protect Your Engine From Carbon Buildup With This Proactive Maintenance Mod

Modern direct injection motors all have one common flaw – carbon buildup. You may be thinking, why does a modern, sophisticated engine have this issue?

Well, in the old port and throttle body injection motors, the air/fuel mixture would flow over the valves and more or less clean them, preventing oil from sticking to the valves and entering the intake from the positive crankcase vent (PCV). Without the air/fuel mixture flowing over the valves, the mixture from the PCV can stick and get baked onto the valves.

Fortunately, there is a way to prevent this from happening. The J&L Air Oil Separator (aka oil catch can) is essentially an oil filter for your intake. The catch can/filter is fitted between the PCV valve and the intake manifold and captures oil so it does not reach the intake.

Note: This air-oil separator should be compatible with both non-hybrid and hybrid powertrains.

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J&L Air Oil Separator Review

My installation experience was a tiring and troublesome 30 minutes. That’s to no fault of J&L, my struggle is purely based on the location of the PCV and having sausage fingers. Aside from my physical limitations, the installation was straightforward and relatively simple.

Tools Required

  • Long reach 90* needle nose pliers
  • Phillips head screwdriver
  • 10mm socket
  • 1/4” socket
  • Ratchet for sockets
  • Extension for socket
  • Fender cover or a soft towel
  • Lithium grease (optional)

Step 1. Remove Engine Cover

3rd Gen Tundra Engine Cover Removal

Remove the engine cover by lifting the front of the cover and pulling it towards you after the rivets on the front are free.

Step 2. Remove Wire Harness

Installing Oil Catch Can 3rd Gen Tundra

To remove the wire harness in the image above, gently lift it up and slide it towards the driver’s side. Once free from the mount, tuck it under the large grey wire loom so it is out of the way.

Step 3. Remove Hose Clamp

3rd Gen Tundra PCV Hose

You’ll need the long-reach needle nose pliers and a towel.

For this step, you will practically be laying on top of the engine to reach the very back middle of the engine – this is where the PCV is located. This is the hardest part.

To remove the PCV hose, use the needle nose pliers to squeeze the hose clamp and gently slide it past the barb.

Note: Take care not to damage the PCV valve as it is plastic. Once the clamp is off the barb, you can gently slide the hose off the PCV. Leave the hose clamp on the hose.

Step 4. Attach Line With Barbed Fitting

Installing J&L Air Oil Separator 3rd Gen Tundra

The PCV barb is buried and very difficult to get a camera back there to take a photo. Apologies for the lack of imagery here.

The J&L kit comes with two hoses – One has a 90* elbow attached with a barbed fitting. Install this hose first.

Insert the barbed fitting into the hose that was removed from the PCV and slide the hose clamp over the barb. It is a bit of a fight so be patient. A small dab of lithium grease could help here.

Once it is attached, route the hose over the engine and toward the driver-side intake.

Step 5. Install 90-Degree Hose

J&L Air Oil Separator 3rd Gen Tundra Installation

Slide the supplied hose clamp over the short hose with the screw drive facing the passenger side and on the top side of the line.

Next, slide the short end over the barb on the PCV. Once it is over the barb, tighten the hose clamp and route the hose toward the driver-side intake. It will appear to be oversized but rest assured it will tighten down and seal properly.

Then, reinstall the wire harness by sliding the harness back onto the holder.

Step 6. Attach Can Bracket

J&L Air Oil Separator 3rd Gen Tundra Bracket

Remove the 10mm bolt that holds the large grey harness mount (I’m not sure what the actual name of this part is).

Next, place the supplied washer on the harness holder and place the catch can mounting bracket over the washer. Reinstall the bolt finger tight.

Step 7. Attach Catch Can

J&L Air Oil Separator 3rd Gen Tundra

Align the logo on the catch can with the logo on the mount and install the supplied Phillips head screws. Align the catch can so it is about 1/8-1/4” away from the large grey harness and tighten the 10mm bolt.

Step 8. Attach Hoses

J&L Air Oil Separator Hose Attachments

Slide the beauty covers over the end of the lines coming from the back of the engine and attach them to the catch can. The PCV hose attaches to the 90-degree barb of the catch can and the other attaches to the straight fitting.

Use some lightweight grease if needed on the inside of the lines to help make installation easier.

Step 9. Add Interval Sticker

J&L Air Oil Separator Service Interval Sticker

Check your current mileage and add 1,000 miles to notate your first inspection. After the first inspection, you will have a better idea of how often the catch can needs to be emptied and cleaned. Each vehicle will be different as to when the oil will need to be drained.

Finally, reinstall the engine cover. That’s it. Close the hood and take it for a drive!

Final Thoughts

3rd Gen Tundra Oil Catch Can - Fluid Collected Over 500 Miles

The J&L Air Oil Separator is a great addition to an already fantastic vehicle. The build quality of the catch can is amazing, from the knurled base allowing for easy removal, to the beauty covers for the hose lines giving it a clean look. J&L put some thought into this product, and it shows.

Note: The catch can get REALLY hot. I would recommend letting your engine completely cool before checking it.

After 500 miles, I decided to check the can and see what I had captured. To my surprise, there was about 3/4 of an ounce in the can which is a lot more than I expected there to be on a brand-new truck. Based on this, my service interval to drain the unit will be about every 5000 miles.

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