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1990 Force 150HP and synthetic oil

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  • 1990 Force 150HP and synthetic oil

    I've read past posts about synthetic oil and I'm left confused. Will a blend or 100% synthetic oil do harm to my Force 150?

  • #2
    Re: 1990 Force 150HP and synthetic oil

    No.All the rantings on the petroleum/synthetic debate are over which is best, which seems to be a matter of opinion and contradicting "facts" by the two sides.
    Use a NMMA rated TC-W3 oil, either petrol based or synthetic. That is all that is needed for your Force.
    Whatever oil you use, you should decarb annually according to your owners manual. Decarb Process
    Medford, WI


    • #3
      Sign up today
      Re: 1990 Force 150HP and synthetic oil

      Probably not, Mac.See the article on oil type in the FAQ section.Moving to General Outboard.