• Unique patent pending design Reduced fuel octane Higher chance of engine knock ›See more product details.

Most COMPLETE and COMPACT Air/Oil Separator on the market Patent Pending 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.No more having to check/empty your catch can and refilling your oil. The GrimmSpeed&trade 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 The GrimmSpeed&tradeAir/Oil Separator for Subaru vehicles has a unique patent pending design that 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 Air/Oil Separator will help all of these problems . In typical GrimmSpeed&trade fashion, we have made a very compact unit that packs a powerful punch(and looks good while doing it)Please note this product is designed to combat factory as of blow by. If you have a built motor or are experiencing abnormal as of oil consumption, this product may not work for you. Air/Oil Separator FAQ Q Is this beneficial on a street car A Yes. Even in stock form, you will experience oil going through your intake system. If you have ever looked in your intercooler piping you will notice a bunch of oil build up on the inside, our AOS takes care of this problem. Q I've heard about the milky oil substance in cold climates when using an AOS , is that relevant A During our testing here in the frozen tundra of Minnesota we have only noticed very minimal milky substance from