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All ive got done is a mild comp camI've been running it in my rigs for about 7 years now. No complaints, no sludge buildup. I change it every 3k or less. If your motor is stock, I wouldn't worry about the flat tappets because the stock springs are light and the lift is mild.
You might think you want a zinc additive for a high performance flat tappet setup, but you might as well just save the money for new bearings after it shreds itself apart anyway.