I have read and been told that Rotella T is an excellent oil, but it no longer has the Zinc content that it once had. It seems that Valvoline VR-1 (20w50) or Castoil 20W50 is the choice of most who want the added Zinc protection without adding an additive like ZDDPlus, (which ain't real cheap I might add ).

It all comes down to your needs and your wallet as to what is best for your car. Ask 10 different people and get 8 different answers.