Engine Oil?

[Jeff/Illinois]

Originally Posted by Chippy Minton

Absolutely not! The SM lacks the zinc additive vital for older engines. Do some research, SM is NOT suitable!

Chippy, you can run the SM oil if you want the ZDDP, buy a bottle from the antique car vendors for around 5 bucks I think it is, and you'll be fine. One bottle to an oil change around 4 oz. if I recall.

I have to run it in our '69 Mach 1 as it needs the stuff plus it's a high compression engine. Some guys in the Camaro-Mustang world are going to roller lifters then the need for the ZDDP goes away anyway.