if you have a limited slip? I believe that I have a Limited-slip but not sure. Onwers manual states LS was an option? I am wanting to replace the gear oil in a used FD/Diff. I am installing in the old girl and I wanna use the correct lubricant. I have heard there are two types of lube for the various drives. Regular and L/S Is redline synthetic a good brand to use??? Thanks for your help and information, Later, Scott '82 733i 279,000 still purring, with a little growl.... Boerne, Texas