Quote:
Originally Posted by Jeff/Illinois
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.
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Maybe but there is no need. The 15-40 API SL oil that I used is readily available and cheaper than the SM by the same manufacturer.