Article about zinc and flat tappets
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There is also a good article in the Hagerty Insurance quarterly mag that shows ZDDP levels of several different oils.
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I switched to Brad Penn in my 83 from dino oil that the PO used which was Kendall GT-1. Since the BP is part syn I am getting a little weeping that was not there before. No real leaks and no oil spots on the floor just damp. I called Valvoline and they told me that their VR-1 Racing oil that is the Street Legal oil has 1300 PPM ZDDP. I ask a second time and was assured they were talking about the VR-1 oil at the local parts house. Since this meets or exceeds the spec for ZDDP I am considering switching back to the dino juice because of the seepage with the syn in the old engine.
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I'll post the List of oils from the article along their ZDDP levels this weekend.
Torco also has an additive
http://www.torcoracingoils.com/Produ...9-728fe025d0c3
Torco also has an additive
http://www.torcoracingoils.com/Produ...9-728fe025d0c3