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    Flat tappet/zinc content concern ...

    Hi everyone. I've searched prior to posting with no luck, just confused. I have two older GM V8 powered engine cars. 1975 Pontiac GrandVille, 455 1980 Cadillac CDV. 368 I'm lost as to what spec oil I NEED. These cars sit in an unheated garage in NC, mild climate. I used the QS 10w-30...
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