I go with, 3K miles or 6 months... whatever comes first. I like 20W50 for the really hot months here. I run it a little thinner in the cooler months. (Rotella T usually) I used to prefer AC filters, but have recently been swayed to use Puralator.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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