There is a bit of a debate in the Subaru community about putting on a Catch-Can Vs. an Air Oil Separator. The AOS wins out most of the time, and for many people, it works well.

But sometimes the AOS can run into some interesting issues, especially as cars make more power or go on track with sticky tires.

So is the issue with the Specific build? A particular AOS? Or is the issue something deeper?

We have been working to find a better understanding of what is going on with the Subaru PCV system for a while now, and it seems like it is time to have a conversation about about Air Oil Separators, and why they aren't exactly the solution that we all thought they were.

Thanks for watching and Stay Tuned!

In this Episode:
00:00 - Intro
00:14 - Why the need to talk about the AOS?
01:17 - The best way to support this channel and the content we create
01:42 - Current school of thought on Catch Cans, AOSs, and Dry Sump Oiling Systems
03:04 - Where current opinion gets it wrong about AOSs and Dry Sumps
04:00 - Lets define Normal operation for an Air Oil Separator
04:45 - What do you need if a Catch Can isn't enough?
05:04 - Why a Dry Sump oiling system isn't an option for a street car
05:40 - Why Track cars and race cars need Dry Sumps
06:33 - Why the emphasis on Air Oil Separators? We got the problem wrong
07:35 - We failed to ask why oil is moving through the PCV system in the first place
08:05 - What are the signs that your AOS is not working properly or is failing?
09:58 - An Air Oil Separator takes more maintenance than you think
11:05 - An AOS can mask early signs of engine damage and that can be a problem
11:49 - The biggest takeaway you need about AOSs from this video
12:32 - The Dry Sump Solves 2 problems, not just 1
14:24 - A proper Dry Sump will save you a lot of money in the long run
15:27 - Final thoughts

Here are some links to related videos if you want to find out more about some of the topics discussed in this video:

Crankcase Pressure:
   • An In depth look at what Crankcase Pr...  

3MI AOS Drain Hose:
   • The 3MI Air Oil Separator Drain Hose ...  

How and why we changed our Dry Sump plumbing
   • How and why we changed our Dry Sump p...  

PCV System Over Run:
   • How can you tell if your PCV System i...  

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

Is an AOS Just a Band-aid?:
   • Is an Air Oil Separator just a Band-aid?  

A look at AOS configuration - Recirculating Vs. Atmospheric
   • A look at Air Oil Separator Configura...  
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