Hi, it's me again. It seems the best oil for any car is going to be a full synthetic made by one of the smaller manufacturers. But let me ask a narrower question: Consider a '95 BMW M3 with 119K miles, driven daily to work, usually given full throttle when fully warm once each day but not flogged. Engine does not burn or leak oil, had perfect compression numbers at it's pre-purchase inspection at 93K miles, and has probably had dino oil changed frequently since new. Considering they are about equal in price, which is better, Castrol Syntec Blend 20-50 or Castrol's high-mileage oil? Again, I live in S. Calif. where it never gets below 40. Thanks again!