Posted by Steve@Advance on November 16, 2019 at 07:05:01 from (66.169.147.211):
In Reply to: Zinc in Oil posted by David g on November 15, 2019 at 20:40:55:
I'm a believer in using racing oil or zinc additive with a flat tappet cam on the first start up and break in. Especially on a performance engine with strong valve springs and high lift.
But after that it's not real practical to continue that practice. Especially if it has a catalytic converter.
I do think the diesel oil, (whether it has zinc or not) is a closer match to the older engines with flat tappet cams than spark ignition oil that is formulated for roller cams, valve timing devices, and sophisticated emissions controls.
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