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Flat tappet cams need extreme pressure additives like Zinc Dialkyl DithioPhosphate (ZDDP). These additives have been all but removed from motor oil over the years because ZDDP degrades catalytic converters and is not needed with roller cams anyway. The best bet is to use oil made for flat tappet cams like Brad Penn or Joe Gibbs hot rod oil. Its not cheap but will protect your flat tappet cam. There are ZDDP additives available like GM's EOS but any time you add anything to your oil you are taking a chance because additive clash can occur. I have noticed as of late that several oil companies are making oils with somewhat more ZDDP. Mobil 1 high mileage is claimed to have a higher level of extreme pressure lubricants and can be used in older engines. I would guess it would be fine for stock applications but it would not handle the high valve spring pressures needed when using a radical flat tappet camshaft.

Bill
 

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Discussion Starter #3
^^^excellent info, exactly what i needed to know. Thanks Bill.
 
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