here is what i got back from Mobil1
Mobil1 Synthetic Gear Lubricant 75W90 is rated GL-5 and most manual transmissions require a GL-4 specification therefore should not be used.
and the person that told me to use it ?
http://www.scoobymods.com/forums/sho...&threadid=1743
Thats lame that they would recomend that and the fact that it took me this long to get an answer from a few dirfront subaru techs.