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What type of oil should I use?-gctid388194

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    What type of oil should I use?-gctid388194

    I am currently working on my 1989 2150, and its come time to change the oil. After a hour of pumping out oil Ive changed the filter, but cant find a definitive oil type to use. Does any one know what oil I should use for a 1989 351(5.8l) OMC Cobra?

    Matt

    Akron, Ohio

    #2
    OMC recommended a straight 30, you could use that, a straight 40 if not boating in cooler temps, or the Merc 25/40 oil. I would not use automotive multi-vis oils such as 5w30 or 10W30 because they thin out under sustained high rpm use in marine engines. I like Chevron Delo 400 straight weight.
    88 Four Winns 200 Horizon 4.3 OMC
    98 Jeep Grand Cherokee 4.0/Selectrac
    07 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

    Long Island Sound Region

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      #3
      When I replaced the oil filter I filled it with 5w30 Havoline should I drain it, the oil Pan is still empty?

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        #4
        You could if you are fussy, but it probably won't matter much. Just use a good straight weight from now on, or the Merc oil.
        88 Four Winns 200 Horizon 4.3 OMC
        98 Jeep Grand Cherokee 4.0/Selectrac
        07 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

        Long Island Sound Region

        Comment

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