No they don't. I just said ALL engine oils MUST have zinc (which IS ZDDP which is zincdialthylditiophosphate...spelling is questionable) so all engine oils have it.
Zinc is an incredible power eater. More isn't always better.
The tribologists who develop oils do so with fuel usage in mind. A gas oil isn't the same as a diesel oil which isn't the same as an oil used for alcohol based fuels.
And the additive packages (and base stock choices as well) for each fuel group is different.
