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  1. #1
    Seaman
    Join Date
    Mar 2003
    Posts
    62

    Default 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. #2
    Supreme Mariner roscoe's Avatar
    Join Date
    Oct 2002
    Location
    Medford WI
    Posts
    18,125

    Default 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




  3. #3
    Moderator JB's Avatar
    Join Date
    Mar 2001
    Location
    The Hideout, Whitt, TX, USA
    Posts
    45,902

    Default Re: 1990 Force 150HP and synthetic oil

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

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