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1994180 HP 4.3L/Weber 4bb Oil-gctid821489

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    1994180 HP 4.3L/Weber 4bb Oil-gctid821489

    My old 180 HP 4.3L calls for "Quicksilver 4 cycle marine oil" in the manual and I see Mercury has new oils out there such as their synthetic blend SAE 25/40. Which oil would be best in this engine?

    Thanks,Gerry
    1994 2050
    4.3L 180 HP Alpha One
    21 Al prop ,new starter
    NW Ontario,Canada

    #2
    Well, I used Mercury 4 stroke 25/40 oil in the 4.3L and it seems happy

    The previous owner said he thought 10/30 was in there and OK... I noticed the oil pressure drop to about 42lbs (@4000rpm) as it heated up- now with the 25/40 it hovers around 55 PSI and stays there. Thankfully there are very few hours on this boat :cheer:
    1994 2050
    4.3L 180 HP Alpha One
    21 Al prop ,new starter
    NW Ontario,Canada

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