[MAGNUMB]

It looks like the one for WRX would work on the Ascent. Anyone install one of these? Looks like the only one that is approved by Subaru and won't void warranty or smog.

I've noticed the inside of my PCV line is oily compared to my Legacy.
Would hate to find out years down the road that the valves and intake are full of carbon.

https://crawfordperformance.com/blogs/tech/all-about-subarus-original-air-oil-separator

 

[Trey T]

I was looking into BMW oil-air separator for the Ascent ... like this:

I like the self-maintenance feature, having the oil return back to the pan. The cost is very reasonable, about $100 or less for the unit and hoses.

 

[MAGNUMB]

Interesting!
I was also looking at factory Mustang Air/Oil separators. Might be the cheaper route for sure to go with OEM type.

 

[Trey T]

I don’t think the Mustang one has the same conceptual design as the Crawford or the one I suggested. It needs to have 3 ports: 1 from crankcase; 1 to intake; 1 return to oil pan.

I wonder if there’s a unused port somewhere for return

 

[Wildcrd76]

Crawford performance has told me that an ascent AOS is in the works, but they can’t give me any sort of time table or even estimate. As far as the ports you’re looking for, perhaps these 2 capped lines are what you are looking for

I saw these when I was installing the whiteline pitch mount. These are underneath the top mount inter cooler. I didn’t trace the lines as it was quite hot that day. I’ve asked the dealer but they have no idea.

 

[MAGNUMB]

didn’t trace the lines as it was quite hot th

That whiteline product is interesting.
Do you feel any additional vibrations be transmitted into the cabin and why did you decide to install it?

 

[Robert.Mauro]

Crawford performance has told me that an ascent AOS is in the works, but they can’t give me any sort of time table or even estimate. As far as the ports you’re looking for, perhaps these 2 capped lines are what you are looking for View attachment 518

I saw these when I was installing the whiteline pitch mount. These are underneath the top mount inter cooler. I didn’t trace the lines as it was quite hot that day. I’ve asked the dealer but they have no idea.

Both of those are the air breathers for your CVT.

The CVT starts at the seam farthest right, though parts of the intake/intercooler hang back (image left) above it.

 

[nene503]

I am failing to see where it states that this is the only AOS approved by Subaru to not void your warranty. Can you please point to me where it is in their website or that Subaru has stated this? I think the AIG AOS is a better design.

 

[MAGNUMB]

I am failing to see where it states that this is the only AOS approved by Subaru to not void your warranty. Can you please point to me where it is in their website or that Subaru has stated this? I think the AIG AOS is a better design.

I've read on their website they are only aftermarket supplier to ever be backed by Subaru of America....now that I'm thinking about it could mean sponsored? But that would be odd that Subaru has never sponsored any other company??

In any case they shouldn't void warranty if properly installed as they only provide benefits for turbo engines and direct injection engines. They are easy enough to remove if you have to bring in for service.
I think the only reason they don't come from the factory with one is the cost.

 

[R P]

Maybe you don't need one if Subaru deployed this in their DI engines.

US20120080015A1 - Breather apparatus for engine - Google Patents

This breather apparatus has a rotation separator that is fastened to a camshaft, and that rotation separator has a base plate section and a plurality of protruding plates that extend from the base plate section. Moreover, a separator housing is provided in the cylinder head, and comprises an air...

patents.google.com

 

[MAGNUMB]

Very interesting.
I see the application status wasn't active until this month...the same month these same engines are being installed in the new Outback and Legacy.
Maybe this is for those models and was excluded from the Ascent?

 

[Robert.Mauro]

I will check.

 

[ChuckKaty1]

Hello Robert, I know you are on Vacation, but I was just wondering if you had received an answer on this issue? Have fun and thanks

 

[Robert.Mauro]

Hello Robert, I know you are on Vacation, but I was just wondering if you had received an answer on this issue? Have fun and thanks

I haven't had a chance to look at the 2020 Outback's implementation of our drivetrain, but I suspect it's very similar (gearing differences and maybe CVT clamping pressure differences due to the much lower weight and much lower towing), but, I am not aware of anything that indicates any such addition to the FA24DIT.

Elsewhere I mentioned their mitigation methods, but that's all I've found. Lucas (a trusted name) says this works, but, I have no intentions of spraying this into my intake system until it's been out for a while and thoroughly tested, and have run it by a Subaru Master Tech or one of their engineers.

Deep Clean™ GDI | Lucas Oil Products

Lucas Deep Clean™ GDI is designed to remedy and prevent problems associated with the harmful carbon deposits that rob your engine of performance and fuel economy.

lucasoil.com

 

[motorbreath]

Has anyone determined if this internal centrifugal separator is actually present in the FA24DIT used in the Ascent and other Subaru vehicles?

The OP has observed oil in the PCV line, so either way there is some concern, but before I go through the trouble and expense of installing an AOS.

Given that the engine has an EGR and even with an AOS there are going to be droplets getting past it into the intake, it might be a better investment to save the money from buying and installing the AOS for valve cleaning service or DIY equipment.

Maybe you don't need one if Subaru deployed this in their DI engines.

US20120080015A1 - Breather apparatus for engine - Google Patents

This breather apparatus has a rotation separator that is fastened to a camshaft, and that rotation separator has a base plate section and a plurality of protruding plates that extend from the base plate section. Moreover, a separator housing is provided in the cylinder head, and comprises an air...

patents.google.com