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GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
Community Media
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator (Part Number: )
GrimmSpeed Air Oil Separator
Subaru WRX 2002-2007 / STI 2004+
Read 35 Reviews | 15 Q&As
Part # 078006
$299.00

In stock! Ships same day

Features & Product Details

The Grimmspeed Air-Oil Separator (AOS) is one of RallySport Direct's highly sought after items. Grimspeed uses a unique patent pending design which allows you to maintain your PCV valve while separating oil from the air in both the heads and crankcase. These boxer engines have inherent issues with harmful oil and vapors getting into the intake system of your vehicle which can cause issues like having an effect on the octane rating with your gas, and after long periods of use and mileage can cause buildup on your valves.

This particular air-oil separator takes the place of an oil catch can, or a tank which is convenient to eliminate the need to empty the catch can. This is a subtle installation that replaces your factory oil filler cap.

New lines, fittings, and zip ties will be included to make this catch can system ready for the installation. 

Note that this particular unit will come in the anodized black finish for protection against corrosion, and to add a nice touch to the theme of your engine bay. 

Specifications

Brand: GrimmSpeed
Color: Black
Installation Hardware Included: Yes
Material: Aluminum
Mfgr. Warranty: Lifetime
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days


Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
RallySport Guarantee

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REVIEWS & CUSTOMER MEDIA

35 Reviews
4.7 out of 5 Stars
5 Stars
(28)
4 Stars
(4)
3 Stars
(2)
2 Stars
(1)
1 Stars
(0)
Customer Photos and Videos
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
GrimmSpeed Air Oil Separator ( Part Number: 078006)
1 of 1 people found the following review helpful
Not perfect but it checks all the right boxes.  12 months ago
SoulFallen
I've had this installed for 5000 miles now and I put it on after a fresh change of oil so I think I can give an accurate evaluation to its performance. This is not going to perform as flawlessly as a $500 swirl pot unit but it certainly gets the job done; this product more or less shines in the ease of installation department. I was using just over a quart every 5000 now i'm only using just enough to see it move on the dipstick before an oil change, maybe 1/4 a quart or less is being used every 5000. Would have liked to see clamps included instead of zip ties for a product at this price point and oil does seep out of the top (you can see some grime stuck to where oil has worked its way out in the photo) so it ranks mediocre in quality for those reasons. Overall would purchase this item again because the value is still there despite my complaints, It just gets the job done.
  
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2 of 2 people found the following review helpful
Back in Black 2 years ago
Kent C.
I bought one of these in blue for my WRX, and the black one is for my Forester XT. I absolutely love it. A little peace of mind for some engine longevity, this is definitely a good buy. GrimmSpeed includes more tubing than you need, especially depending on how you route it - there are several different options and ways to do it, and you can get a little clever with it if you choose. You will have to cut the tubing to the right lengths, though, so make sure you have a really good knife, or a great hose cutter. Also, this does replace your oil cap, so make sure you've got a 19mm socket to help gently remove this in case you have been running low on oil.
  
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Looks good 4 years ago
derekbutler9402075
Bought mine off the Grimmspeed website. It was under the Garage Sale section for $179. It's mixed colors but I don't really care because you never see it anyway. Honestly, it was a PITA to install. That's only cause I live in Maine and decided to install it on a 30 degree day and all the lines were very stiff so the half to half connectors were very difficult to put in. It does look great though. Especially after zip tying the hoses together. Which reminds me, the zip ties that come with this are crap, every single one of them broke on me. Went to the hardware store and picked up a pack of heavy duty 7 ties for about $5.
  
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Great fitment and quality 4 years ago
watervilleimport03344
install was very easy, i even went a step further and routed almost all of the hoses underneath the manifold so you barely even notice its aftermarket. very happy with product, also noticed that there is no oil in the intercooler after running it
  
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Great fitment and quality 4 years ago
watervilleimport03344
install was very easy, i even went a step further and routed almost all of the hoses underneath the manifold so you barely even notice its aftermarket. very happy with product, also noticed that there is no oil in the intercooler after running it
  
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QUESTIONS & ANSWERS

  • Q: Street /track  13stisedan1 month ago

    Hi I read a review from a few years ago here about the older version of this AOS not seperating properly after heavy track use causing it to smoke from the cap seal and it was stated that GS is aware and working on an update? I'm guessing because of the style of this AOS that a proper track version isn't in the works?
    • 0 of 0 people found the following answer helpful

      A:  I would recommend looking at other options if you are going to use your car on the track

      Devan M. @ RallySport Direct 1 month ago  
        
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  • Q: Fitment  dmonti117399513 years ago

    Someone is selling one of these off of a 2012 wrx, why will a 2012 STI confirm fitment but not a 2012 wrx? It is just the part that screws in and i am wondering if its just that particular part will it work?! :)
    • 0 of 0 people found the following answer helpful

      A:  The 2008-2014 WRX models have a very different setup when it comes to induction and ventilation, it may be adaptable but this is not a direct fit and purchasing the correct AOS for your vehicle is recommended for ease of install.

      Nick S. @ RallySport Direct 3 years ago  
        
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  • Q: Install video valid on 15 STI?  wongchonghing852583 years ago

    Was curious if the install video applies for the 2015 STI? All step and procedures are the same in the video for installation on 2015 STI?
    • 0 of 0 people found the following answer helpful

      A:  The install should still be the same on your car.

      guest56ad69792a8d256e198b66b5 @
        
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  • Q: Power Rating  sikknt4 years ago

    Does this still work if you're running 400hp?
    • 0 of 0 people found the following answer helpful

      A:  This will still work with no issues.

      Kyle A. @ RallySport Direct 4 years ago  
        
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    • 0 of 0 people found the following answer helpful

      A:  Horsepower shouldn't be a limiting factor as long as your engine is running healthy and has no more than factory amounts of blow by. Mike

      GrimmSpeed
        
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  • Q: does it fit a 08+ wrx or only sti?  nicatlotus633594 years ago

    Will it fit my 2013 wrx or sti only?
    • 0 of 0 people found the following answer helpful

      A:  We have a different part for the WRX http://www.rallysportdirect.com/GrimmSpeed-078016-Air-Oil-Separator Mike

      GrimmSpeed
        
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    • 0 of 0 people found the following answer helpful

      A:  Unfortunately this one is not made for those years of WRX's however, here is the Grimmspeed AOS that you would need: http://www.rallysportdirect.com/GrimmSpeed-078016-Air-Oil-Separator

      guest57853c642a8d25b5018c44a7 @
        
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