I need this GM 75w-90 Synth for my pickup and have a chance to buy some at a good price ($8.00/L - which is really good around here). Nothing around here (other synthetic gear lube brands) is competitive in terms of price. I'm thinking of buying some extra for my BMW (car and motorycle final drive) and am wondering if this is decent stuff that people would use in products other than GM (for the purposes of protecting warranty). IIRC, I have read that this is a very good gear oil, but the only downside is that it's over priced. Any thoughts would be appreciated.