I would like to get a concensus on what gasoline BMW owners use and why. I know that each gasoline manufacturer puts their own additives in for different reasons. I have been using Sunoco for many years but I'm not sure if I'm getting the best performance I can in both my 525 and 325. Actually, both cars seem to run fine on Sunoco 89, 91 & 93, but truthfully, I would'nt know what to look for anyway. I appreciate any answers from the group. Thanks guys & gals.