Ah ok. I knew it wasn't a big difference but never experienced it myself So figured I'd go with OE recommendations but I'll go with the word of experience and do 75w90 all around. Gonna be doing it Saturday so hopefully weather isn't too cold
Nvm found the exact amount from the dealer. For a 98 impreza outback sport. 2.2 with a manual transmission it calls for 3.7 quarts of 80w90 for front diff/transmission and 0.8 quarts of 75w90 for the rear diff