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Zinc & Phosphorus -- Brad Penn Oil Zinc & Phosphorus -- Brad Penn Oil
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  #16 (permalink)  
Old 04-30-2009, 09:15 AM
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Join Date: Jul 2008
Location: Driftwood, TX
Cobra Make, Engine: Contemporary Cobra, 427 side oiler
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I do business with several oil companies here in Houston and the few engineers I have spoken to agree with Jim above that 1200-1400 is plenty and beyond that there could be corrosion issues. I am running Valvoline VR-1 straight 40 in my new flat tappet S/O and it has 1400 ppm of zinc.

Patrick, you note that your engine has 4k miles now, did you happen to do a Blackstone when it was right off the dyno for comparison?
Last edited by elmariachi; 04-30-2009 at 09:38 AM..
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