They pulled most of the zinc out of oils several years ago because it was linked to plugging up catalyst converter. Means almost all vehicles had roller cams by the very late eighties, there really wasn't a great need for high zinc ppm. Our older motors with non roller cams need the zinc. This is especially true on new cams. You can add zinc with additive (bought at local parts store), order it on line (ZDDP Maxx), or run a oil that has it already in it like VR1 Valvoline (O'reilly's sells it) for examples. These by all means aren't the only choices, just examples.
