Home Forum Ask A Member 1950 Wizard fuel mix

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  • #21162
    mercuryman
    Participant

      Mercury Bulletin Number 80-6:

      "A. USE OF FORMULA 50-D OIL IN OLDER MERCURY OUTBOARDS

      Formula 50-D oil can be recommended (at a 50:1 mixture) for use in earlier Mercury outboards regardless of year of manufacture.

      Formula 50-D also can be used in other brand outboards (at a 50:1 mixture), provided that the manufacturer recommends use of a 50:1 oil mixture."

      The above was copied verbatim from a Merc Service Bulletins Microfiche.

      Copied from Johnsoldmercury.com

      #21183
      firstresponder01
      Participant

        Thank you so much buddy. My rebuild kits come on next Tuesday so hopefully by next week Friday I will have her up to running. That would be really cool.

        #21217
        Steve A W
        Participant

          I use Penzoil full synthetic at recommended ratio.
          Its better for the environment.
          Actually I’ve run 16 to 1 in My ’57 Johnson 18hp It’s supposed to
          have 24 to 1 and haven’t had any trouble.

          Steve A W

          Member of the MOB chapter.
          I live in Northwest Indiana

          #21221
          Casey Lynn
          Participant

            US Member

            I see you made it over here okay………good deal !
            FrankR made a very good comment to you in his early post. One that you should possibly re-read and absorb.

            #21223
            firstresponder01
            Participant

              Yes sir pappy. Thanks for telling me about this forum. Lots of great info. Have been doing a bunch of good reading. I did see that comment from Frank. I have to agree from comments on this post to alot of other readings I have found, it is really user descrestion almost.

              #21224
              firstresponder01
              Participant

                BTW pappy I did email that gentleman about the impeller. Thanks for that information too.

                #21238
                1946zephyr
                Participant
                  quote Pappy:

                  I see you made it over here okay………good deal !
                  FrankR made a very good comment to you in his early post. One that you should possibly re-read and absorb.

                  +1 on that. I have seen a lot of posts by Frank on here and on iBoats that should be absorbed. He helped build a lot of these OMC’s that we’re now restoring. 😎

                  #21247
                  Casey Lynn
                  Participant

                    US Member
                    quote firstresponder01:

                    Yes sir pappy. Thanks for telling me about this forum. Lots of great info. Have been doing a bunch of good reading. I did see that comment from Frank. I have to agree from comments on this post to alot of other readings I have found, it is really user descrestion almost.

                    As I mentioned in the other forum, oil is cheap in comparison to locating, purchasing, and installing a "new" vintage powerhead because of damage from a marginal oil ratio.
                    On these forums you will be able to easily search oil quantity debates ……. Common "knowledge" if you want to call it that.
                    You will be able to search jeweled vs. non jeweled engines pretty easily as well……….again, common knowledge.

                    But in almost all cases that’s where the so-called "knowledge" stops.

                    What you will not be able to search out is the fact that materials these rotating parts were made of (way back when) changed as the oil ratio went down to an industry standard of 50:1. It wasn’t a kind of "Aw Hell, Vern, we coulda’ been runnin’ half as much oil all this time" evolution around the halls of the various engineering departments of the engine builders.
                    From silver coatings in the rod and wrist pin bearing cages to a vast array of material make up differences in the pistons to minimize scuffing, engines and engineering had to evolve to the point where engines would live with leaner oil mixtures. Try to find references on these differences……….
                    Pistons alone changed materials, ring material, ring shape, ring thickness, ring height, # of rings, ring design (keystone, semi-keystone,pressure backed, etc) piston dome shape, wrist pin location (to minimize thrust loads) etc. more times than I can remember.
                    Our antique and vintage fleet of engines were in the Flintstone era, material-wise, and are at a distinct disadvantage when forced to run with a leaner oil mixture.
                    Choose wisely!

                    #21248
                    jeff-register
                    Participant

                      US Member - 2 Years

                      I prefer to run with more oil as the service write up assumes all motors are like new condition. They were built when Roosevelt was president.

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