Quote:
Originally Posted by paintdude258
I have been told by my local 86 group and my STI friends to always go with Motul Gear 300. I want no part in a subjective debate, but just curious if I am missing something? Is Motul too expensive? Not good for our cars? I am about to change my fluids again after doing Motul in both Tranny and Diff about 30k miles ago and am open to suggestions if there is a different consensus on what is best for our cars.
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Gear 300 is GL5 rated, which while acceptable in the 86's differential, it is not acceptable for the transmission. Other FWD Subaru's do require GL5 in their transaxles due to the incorporation of a differential (hypoid gears) into the unit, but our transmission does not have this.
That's not to say Gear 300 will immediately make your transmission explode. You could probably use olive oil for a while and get away with it. However, the additives which make the oil GL5 rated also have a detrimental long term effect on the yellow metals used in any transmission designed around GL3/4 oils, which includes ours.