Not Ranked
Running three cars with flat-tappet engines and have worked with a lot of race engines, I've settled on Brad Penn oil. As with Joe Gibbs oil, it has sufficient ZDDP in it, but at a lower cost. Nice thing is Brad Penn has a broad selection of weights including break-in oil.
http://www.bradpennracing.com/News/june192007.html
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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