Originally Posted by suuichi
I dont know why people just dont use the OEM oil its not that much more expensive and it has all the chemicals and additives needed for the boxer engine there are very few oils that are equivalent or superior to it. If you tune up your engine you will want a more superior Oil.
Reference: 02 jap spec STI and a friend who tunes STI's for a living.
OEM Subaru oil is nothing special.. Most dealers will use the cheapest oil they can get a 55gallon drum of.