Thread: Oil ratio

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  1. 12-26-2018, 05:56 PM #1
    jbasslouie
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    Oil ratio

    I recently purchased a boat with a 225 hp 2.5 ProMax SS. It does not have a separate oil tank, previous owner manually added oil ( Premium Plus synthetic 2 cycle) to it.
    First time he told me 50:1 ratio, then later said 40:1 ratio, but he didn't sound confident.

    What is the correct ratio?
    Unfortunately, I don't have the serial number readily available as the boat is stored elsewhere.
    Thanks
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  2. Matt Wayne
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    #2 12-26-2018, 08:47 PM
    If you plan on running it over 6000 rpm I would go 40:1 and stay with the premium plus.
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  3. jbasslouie
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    #3 12-27-2018, 09:43 AM
    Thanks Matt.
    If you or anyone else have any pointers / tidbits on this motor, would like to hear it from the forum.
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  4. scbasscatowner
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    #4 12-27-2018, 11:24 AM
    I run 40:1 in my promax i also use 93 octane gas with ethanol treatment and quickleen.
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