If you have a Subaru WRX, STI, or BRZ, there is a good chance that you have at least thought about putting an Air Oil Separator (AOS) on your car to help the engine work better.

You may have already installed one on your car.

There are so many brands and designs of Air Oil Separators, it can be difficult to pick one, and if you have installed one, is it really working as well as it should?

We get asked these types of questions a lot and we decided to put together a video to tackle these questions, and to give you the best information so you can make sure that you get the best AOS for your car, and that you can make sure that it is working properly after you installed it.

In this episode:

00:00 - Introduction - What AOS is Best
00:36 - Two things you need to know before you pick an AOS
02:00 - Do you need an AOS? Or would a Catch Can do?
03:28 - Remember and AOS is just a Band Aid
04:10 - Red Flags that your AOS isn't working properly
05:41 - Should you pick an AOS for easy install? Grimmspeed AOS
06:54 - Looking at crankcase pressure can indicate if your AOS is working properly
07:35 - Ideally you want to preserve the factory PCV circuits
08:41 - The fittings used on your AOS do matter. What is best?
09:51 - Where you are going to be able to mount your AOS is really important
10:22 - Proper routing of the drain hose is key to AOS function
11:42 - How the 3MI Racing AOS Drain hose makes your AOS work better
13:15 - Which AOS is best for which application?
15:31 - Let's look at the RCM AOS. What makes it different?
17:39 - Final Thoughts and Wrap up

In this episode, we take a look at:

3MI AOS Drain Hose
https://www.flatironstuning.com/3mi-r...

Grimmspeed Air Oil Spearator
https://www.flatironstuning.com/grimm...

Perrin Air Oil Separator
https://www.flatironstuning.com/perri...

Radium Engineering Air Oil Separator
https://www.flatironstuning.com/radiu...

Killer-B Air Oil Separator
https://www.flatironstuning.com/kille...

IAG AOS
https://www.flatironstuning.com/iag-v...

Roger Clark Motorsport Track Attack Catch Tank
https://www.flatironstuning.com/rcm-r...

Hopefully this video is helpful, and here are links to the videos we mention in the video if you would like to research further:

Crankcase Pressure video timed to the Oil Cap AOS data:
   • An In depth look at what Crankcase Pr...  

Is an Air Oil Separator just a Band-Aid?
   • Is an Air Oil Separator just a Band-aid?  

Taking a look at the Subaru EJ25 Turbo PCV System
   • Taking a look at the Subaru EJ25 Turb...  

Thanks for watching and Stay Tuned!
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