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All depends on the motor and application. Most motors could care less what oil is in them. Once you get into the performance end of things, the type of oil will get important. Big flat tappet cams with stiff valve springs need a good high quality oil with lots of zincphosphate (or something close to that) in order to survive. Most of the oils today have that additive removed in order to meet the more strict emissions requirements. Theres been a few articles on it available online. I run Amerilube in my 4.6L stroker motor with a big cam from Hesco. They recomend this oil with their cam and valvetrain so thats what I run.
AARON
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91 MJ Under construction
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