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    NMMA Marine 25w40 - Penrite

    An analysis done at 10 hours, following a salt water hydrolock. Got the engine oil flushed quickly and all seems good. Was in a Volvo Penta 5.7GL (350 Chevy) with flat tappet camshaft. Cheers.
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    NMMA vs Performance Oils

    Hi all, I've been running an NMMA Approved 25w40 in my Volvo Penta 5.7GL (flat tappet cam) and would prefer to be using a similar viscosity oil, with a better ZDDP additive pack. My boat is kept on a trailer and thoroughly flushed with fresh water after each use in both salt and fresh water...
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