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Old 02-02-2019, 11:47 PM   #8
ford38v8
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Join Date: Jul 2011
Location: SF Bay Area
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Default Re: Can NOS oil additives go bad

Quote:
Originally Posted by Tim Ayers View Post
I know what you are trying to say, but Lord I hope no oil is getting to the valves or you have bigger problems than zinc in your oil. LOL
Quote:
Originally Posted by 40 Deluxe View Post
Hmm, there should never be any zinc on the valve seats! There's no way for it to get there unless you have the world's worst oil burner! Zinc additive is to prevent cam/lifter wear in an engine with extremely high valve spring pressures. Zinc is not needed in a flathead unless it's a high zoot all-out race engine.
I think you mean tetraethyl lead once added to gasoline to prevent valve seat erosion.
Quote:
Originally Posted by petehoovie View Post
40 Deluxe - That's exactly what I was going to say but you beat me to it....
Hmm.... What was I thinking? I guess my brain got homogenized with lead and zinc. Heavy metal can do more than blow out your eardrums!
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