[AT] Related Engine Oil Question

[STEVE ALLEN]

The topic of Zinc in modern gasoline-rated engine oils has surfaced in the recent discussion of tractor oil.  

Does anyone know if the "high mileage" formulations currently on the shelves contain the Zinc additives desirable for non-roller cam engines?  Since these oils are sold for use in older engines, I wonder if they are already fortified in that way.

The "original" Steve Allen