Mobil-1. I started useing Mobile-1 in 1988. I was useing the European version though. I used Redline for a while but once I got married and had Kids money cost was important. I returned to Mobil-1 andhave my entire family useing it. For the type of driveing I do M1 holds up fine. I am considering doing an Extended drain of Redline in the not so distant future just to see what I see.