Mobil1 synthetic is the best oil ever made imho. I didn't believe in it until my Mobil 1 fan boy friend had me tear down his "always ran M1" 120K motor to refresh it. He daily drives it as well a runs it at the drag strip 2x a month as well. The cylinder cross hatch was not only visible but looked brand new/freshly honed. The bearings were hardly worn. I was shocked and converted myself to a M1 fan boy for gasoline engines at that moment. Valvoline is my 2nd, but still high preference, choice for engine oil, and #1 for trans, gear, etc.