It took a while, but I finally found this, looks like it is just fine for oldies!
Since January 8, 2008, Brad Penn� Penn Grade 1� High Performance Oils have been formulated with a typical 1500 ppm zinc and 1340-1400 ppm phosphorous additive concentrates.May 17, 2010
puzzled by gas types
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ImperialAtom
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Re: puzzled by gas types
Matt - I'll try some of that next time. Right now I went the expensive route and got the additive instead.