I can't figure out what kind of differential oil to use on my 2001 S. I've read three times now that a GL-5 oil will harm the synchro's...so what kind should I use?
Heres from the manual:
SAE 90, GL5 or GL6
Honestly I think its like engine oil.. As long as it's there and clean then you are ok. Ofcourse there is always a preference with this one too. Could be wrong. I just found some off the shelf at a local auto parts store. Also it depends on the application and what not.