Diesel oils no longer have zinc in them either. New semis have catalytic converters and exhaust filters. That's why the fuel is now ultra low sulfur and the oil has been changed.

I run Valvoline vr1 racing oil. Usually in a 20-50 for summer 10-30 for winter.

Valvoline has vr 1
Kendall has gt 1
Lucas has a classic car formula
Amsoil has a classic car formula
Joe Gibbs racing """""""""
Schaffer's. """""""""""""


There are probably other oils that have zinc additives.

There's also the replacement zinc additives you can buy.. I know the hyper lube zinc additive doesn't contain zinc..
Comp cams, edelbrock, Lucas, and others sell bottles of zinc replacement.
Stp in the blue bottle iirc contains zddp which is a zinc replacement. Problem is I couldn't get anyone at stp to tell me how much zinc in parts per million the bottle contained nor how much ppm it would be mixed with 5 quarts of oil.

For good oil info check out bob the oil guy...