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How about this, says needs no additives for th flat tappet cams.

http://www.joegibbsdriven.com/products/hotrod/hr1.html


At $10 a quart? save your money and use the additive
Even stuff like rotella(with zinc) should have the additive added.


$8 quart from Amazon. How much is the zinc additive? They say the high detergent in the new oils won't let the zinc additive do its job fully. However plenty of folks uiing it with no flat cams.