i'm sure this has been asked a billion times over but i did a search and it wasn't too specific! what oil is best for my 1990 2wd saph engine and gearbox? it's been run on mobil 1 15/50 for years but a lot of people seem to have issues with that now? also wanting to change the gearbox oil, now i'd always been lead to believe the T5 box ran on pretty much ATF fluid but after looking on the opie oils site they seem to be recomending a 75/90 grade transmission oil?

what are you using folks?