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post #2 of Old 08-01-2010
Gene T
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30 should be fine unless it is an old engine with lots of hours on it, then use 40. I use 15-40 I think but it is recommended in my manual. There is probably little advantage to a multi weight oil in boat engines. The transmissions want straight weight oil anyway. Just use Delo or another Diesel approved oil. Use the best filter you can get too.

Gene


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