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  1. 05-25-2025, 02:33 PM #1
    smughal31
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    2007 Optimax 115hp Oil question / help

    long story short I bought a boat from a guy and he gave me the oil for it in a jug that doesn’t display what it is. I have always ran the oil show in the picture but after researching I need to be using the DFI oil since this is an optima. It is very hard to find where I live. Am I good to use the quick silver premium plus or do I need to be using the DFI oil? Whats currently in the tank is brown so I would be mixing the two to begin with.

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  2. EuropeanAM
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    #2 05-26-2025, 01:19 PM
    What's in the tank is very likely Optimax/DFI oil. Until recently it did have a brown appearance.

    Strongly recommend sticking with that oil. Local dealers, and major retailers that carry Mercury/Quicksilver should have that available for you to purchase, even if you have to order it in advance.

    In a pinch, Premium Plus is acceptable.


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