The word on the street is rotella is either lowering the zinc level or has already done it,gm EOS,less than 5 $ a bottle at your gm dealer,will boost your zddp level for cam break in,don't assume any oil has it even racing oil unless you read in print that it specifically does,Smitty

Jeff post this in General Q&A or pm Hydrocruiser. That guy knows everyhting about oils.