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I have heard Val.Racing Oil is Good and also Royal Purple.



I talked to a rep with Royal Purple and was impressed with their knowledge and understanding of the importance of using the right oils with flat tappets. The rep was of course biased toward his own RP brand, but he advised to just pick a good synthetic (of any brand), and avoid using addtives that we really don't know much about. Some additives with too much zinc could cause an ashing effect, which of course is bad. GM EOS as an example, warns against use after break-ins, and states on the bottle not to use as an engine "additive"