Okay, I need to know the best oil to use in my K1200LT motor, rear end and transmission. I can't see what I'd have to buy BMW oil when there are others on the market that may be as good or better, so with that said, what shoukld I use. Today I went in for the 600 mile check and they did not put GL % in the rear. They used a red synthetic BMW oil. The book say to us GL5. What engine oils and transmission oils can I use. Why didn't they change the transmission oil at 600 miles just like they did the rear end?