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It doesn't affect OHC engines, just OHV engines.
It affects OHV engines, because the zinc coats the lifters and the cam, making the contact smoother. I have pics of what happens when there isn't any zinc added. I'd gladly pass them along, but I don't know how. Does anyone?
There is an off the shelf diesel oil that has it, but I'm gonna buy the Zinc additive. Joe Gibbs Racing along with other companies makes it.
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