How to Install an Oil Separator on a 2021+ Ford Bronco

How to Install an Oil Separator on a 2021+ Ford Bronco

Last Updated January 18, 2024 | Cory Jones

Oil separators protect your 2021+ Bronco's engine from damage and reduced efficiency by preventing oil blow-by. The process works by collecting the extra oil and gas vapor, called blow-by, in a container after it has leaked past the piston rings and into the crankcase. The vapor is then condensed back into a liquid before being recirculated into the engine.

Check out the video below for more information.

How to Install an Oil Separator on a 2021+ Ford Bronco

In this installation guide, we'll walk you through how to install an oil separator in your 2021+ Ford Bronco. Oil separators are perfect for enthusiasts looking to maintain engine health. Without an oil separator, oil blow-by can accumulate and lower the octane of your fuel, causing premature detonation and eventually engine knock

We're installing a J&L Oil Separator kit onto our 2021 Bronco, but the process is largely the same with any brand or model with a few differences. The J&L Oil Separator kit is plug-and-play and doesn't require any modifications to work.

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Tools Needed

  • Socket Wrench
  • Phillips Head Screwdriver
  • Plastic Pry Tool
  • Allen Wrench

Step 1: Disconnect PCV Hose

Locate the black hose with the white clip by your PCV valve and push up on the white clip until it releases. Then, pull the black hose off.

A mechanic disconnecting the PCV hose from the PCV valve on a Ford Bronco

Step 2: Install Oil Separator Bracket

Screw the oil separator bracket onto the threaded hole on the master cylinder using the supplied hardware. Then, tighten the bolt into place.

A fully-installed oil separator bracket in the engine bay of a Ford Bronco

Step 3: Mount the Oil Separator

Take the oil separator hose with the male fitting and route it under the master cylinder. Then, mount the oil separator onto the bracket with the supplied screws.

A mechanic screwing the oil separator into place on the mounting bracket

Step 4: Connect Oil Separator Hoses

Connect the male oil separator hose to the hose you removed from the oil PCV system. Then, connect the other oil separator hose to the unused port on the PCV system.

A mechanic connecting the oil separator hoses to the PCV system by hand

Congratulations, you're all done!

A Quick and Easy Upgrade to Your 2021+ Bronco's Oil System

Installing an oil separator on your 2021+ Bronco is an easy modification that greatly improves the reliability of the engine. However, you'll need to examine the oil separator after the first 1000 miles to see how much oil it has collected during that initial period. Then, check it every few thousand miles and empty it as needed.


This article was researched, written, edited, and reviewed following the steps outlined in our editorial process. Learn more about CJ's editorial standards and guidelines.