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Choose Your Car 
Grimmspeed Air/Oil Separator (Subaru WRX / STi) - Modern Automotive Performance
 - 1


GrimmSpeed

Grimmspeed Air/Oil Separator | Multiple Subaru Fitments

PART#
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AIR/OIL SEPARATOR - WRX/STI/LGT/FXT

An Air/Oil Separator has one job, remove the oil from the engine ventilation system so the oil does not get sent through the intake system.

The GrimmSpeed AOS is unique as it allows you to maintain your PCV Valve while separating the oil out of the crankcase and head ventilation air! Our AOS will allow your engine to run more efficiently due to the separation of oil from the intake system. When there is oil in your system, the result is 1) reduced fuel octane 2) higher chance of engine knock(detonation) 3) worse emissions 4) higher oil consumption. Our AOS will solve all of these problems.

In GrimmSpeed fashion, we have made a very compact unit that packs a powerful punch(and looks good while doing it)!

No more having to check/empty your catch can and refilling your oil. The GrimmSpeed AOS coalesces oil without using a mesh media. Mesh medias can cause contaminates to collect and build up resulting in possible sludge. Our AOS is self maintained so you can just sit back, stop worrying, and enjoy driving your car!

Features

  • Removes oil vapors from the intake
  • Retains OEM PCV Valve

Benefits

  • Effectively increases octane by removing oil vapors from the intake system

Applications

  • 2002-2007 Subaru WRX
  • 2004-2019 Subaru STI

  • 2008-2014 Subaru WRX
  • 2005-2009 Subaru Legacy GT
  • 2009+ Subaru Forester XT

What's In The Box?

  • AOS
  • Fittings
  • Hose

References

Warranty

  • Manufacturer Standard Warranty

AIR/OIL SEPARATOR - WRX/STI/LGT/FXT

An Air/Oil Separator has one job, remove the oil from the engine ventilation system so the oil does not get sent through the intake system.

The GrimmSpeed AOS is unique as it allows you to maintain your PCV Valve while separating the oil out of the crankcase and head ventilation air! Our AOS will allow your engine to run more efficiently due to the separation of oil from the intake system. When there is oil in your system, the result is 1) reduced fuel octane 2) higher chance of engine knock(detonation) 3) worse emissions 4) higher oil consumption. Our AOS will solve all of these problems.

In GrimmSpeed fashion, we have made a very compact unit that packs a powerful punch(and looks good while doing it)!

No more having to check/empty your catch can and refilling your oil. The GrimmSpeed AOS coalesces oil without using a mesh media. Mesh medias can cause contaminates to collect and build up resulting in possible sludge. Our AOS is self maintained so you can just sit back, stop worrying, and enjoy driving your car!

Features

  • Removes oil vapors from the intake
  • Retains OEM PCV Valve

Benefits

  • Effectively increases octane by removing oil vapors from the intake system

Applications

  • 2002-2007 Subaru WRX
  • 2004-2019 Subaru STI

  • 2008-2014 Subaru WRX
  • 2005-2009 Subaru Legacy GT
  • 2009+ Subaru Forester XT

What's In The Box?

  • AOS
  • Fittings
  • Hose

References

Warranty

  • Manufacturer Standard Warranty

Customer Reviews

Based on 13 reviews
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A
Anonymous
Grimmspeed aos

Easy instal. Didn’t use barbs had plenty of hose left. Looks good. Bought the anodized red one.

N
N.B.
Great Air/oil separator for a good price

MAP always has parts ready to ship. They shipped this item to me so fast. I love MAP customer service and the part works great. I’m not going to write a full on review since I’m no professional, but this definitely helps with oil consumption just like all the other A/O separators, but this is priced pretty fairly and the brand never disappoints. Great product and great customer service.

Z
Zachary McInroy
Easy install that makes sense.

Great entry level AoS. If you are looking for a good AoS for a lightly modded daily driver, this is it. If you are going for more power then you may want to look at the IAG street/comp series. My car is a stage 2 and this works great for the minor bolt ons. Helped cleanup Knock and Fine Knock readings as well. Make sure the air going into the car is clean buy an AoS immediately.

T
Tim Osgood
Easy to install

I’m gonna give this part a 5 star review with a few small asterisks. First, the good. It’s super easy to install, much easier than most AOS. Also, it looks great under the hood. It works mostly as stated. You’re gonna see a lot of people making an unnecessarily big deal about the foamy frozen sludge stuff in the winter. It really is only an issue if you’re going on very short drives. This is moisture from cold hoses being in your lines. If your oil is getting up to temp on your drives in the winter it’s gonna evaporate that moisture anyway. No biggie. But if you’re going on short drives and not warming your car up, it could be an issue, but probably still wouldn’t be. Another asterisk is the install directions. They are for a pre 2018 STI. You’re gonna have to do some real digging on youtube for proper install instructions for an 18+. I had to watch a spanish language YouTube video myself lol. So that’s kind of annoying. Also, the cheap zip ties. Zip ties are gonna be fine to put on the joined up sections of hose. But for the three connections that go to the actual 3 metal nipples on the body of the A.O.S. you’re gonna want to grab yourself 3 small worm-gear screw clamps at the hardware store for the connections to the body of the AOS or you’re gonna have leaks. This is verifiable by many youtube videos showing leaks during smoke tests. Just use worm gears there, and warn your oil up before you drive and you’ll be fine. Lets be honest here, if you are driving around with cold oil in your Subie it won’t be long for this world anyhow. Warm your subies up folks. Or you’re gonna have an excuse to buy a built block real fast. We should all know this by now.

B
Brandon Trongale
Grimspeed AOS,

easy to install great quality there is a video on youtube from grimmspeed that shows you exactly how to install step by step. highly recommend it and it looks great. installed on my 17 wrx STI, pick it up you wont be dissapointed

MAP Limited Lifetime Warranty

1.) All MAPerformance in-house fabricated parts include a Limited Lifetime Warranty for the Original Purchaser. This warranty only applies to the original purchaser and is non-transferrable. If the product fails it would need to be determined by MAPerformance that it is due to manufacturing defects in materials or workmanship.

2.) This does not cover normal wear and tear. Improper use, modification, or abuse voids this warranty. MAPerformance will not be held responsible for additional costs due to the failure of a product (cost of sale, towing, labor, etc.). Warranty claims must be submitted to MAPerformance for review.

3.) You must create a support ticket to acquire your return authorization number prior to returning the product.

4.) Warranty claims will not be honored if the product was not purchased through an approved dealer.

For warranty evaluation please create a support ticket via this form Click Here For Customer Service.