ZDDP

Why can’t I just add a bottle of zinc additive to my oil and then just use regular off-the-shelf oil? Won’t that work just as well as those more expensive hot rod oils that have higher zinc levels? GM used to sell an additive called Engine Oil Supplement and we used to add that to

Some engine builders like to use API CJ-4 diesel motor oil as a break-in lubricant for new engines. That’s because it contains plenty of zinc (ZDDP) to protect flat-tappet camshafts. Apparently this oil is being replaced with a new formulation, API CK-4 and CK-4/SN (SN means the oil meets current year API standards). And just