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  1. J

    Need opinion on oil additive or not?

    I just recently replaced the 302HO motor in my 20' Shamrock. The motor is a flat tappet cam motor. I broke the cam in with Brad Penn break-in oil. My question is should I use a zinc supplement to the 20w-50w that the owners manual suggests? This is a 1988 boat so the owners manual is dated as...
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