What is the difference between an Air-Oil Separator and a Catch Can?

Catch Cans have been around for a long time, and so have Air-Oil separators for that matter. But Air Oil Separators are becoming much more the standard these days, especially with Subaru's.

So what is the difference between a Catch-Can and an Air Oil Separator?

The simple difference is that a Catch-Can goes on a line to capture any oil vapor coming out of the engine, and then holds that oil. An Air Oil Separator does the same thing, but then returns that oil to the engine.

But knowing that difference, which one is right for your car, and what do you look for if you are trying to pick an AOS or catch-can?

We have put together this video to hopefully explain why you would want one or the other, and what would be best for your application.

We hope this helps, and thanks for watching!

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