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25 horse Merc 1993 oil to gas

Discussion in 'Boats and Motors' started by bmffishing247, Jul 3, 2005.

  1. bmffishing247

    bmffishing247 Fishing Is Life!

    Just wondering if it would still be 50 to 1 like all other motors. any info would be great.

  2. dip

    dip dip

    50:1 and my old 83 9.8 was 50:1 so i would spect your's is the same.

  3. My older Merc 80hp is 50:1
    Generally 4 strokes don't mix oil.
    Older motors 50:1
    Look at plugs occasionally to monitor oil mix.

  4. I have a 1990 20hp mercury that is 50:1 as well.
  5. The factory recommened oil:fuel ratio is 50:1. With todays new technology with lubrication, i believe that a 25:1 ratio is equivalent to a 50:1 ratio back then, but i would go 50:1 just to be safe.
  6. Since there are 128 ounces in a gallon.

    For a 50 to 1 ratio, you would need to add 2.56 ounces of oil to a gallon.
    Or 12.8 ounces of oil to 5 gallons.

    So for a ratio of 25:1 you would need to add 5.12 ounces to a gallon.
    Or 25.6 ounces to 5 gallons.

    Seems that the new lubricants should need less oil added ? ?
    Would it be 100:1 of new to old now ?
    1.28 oz to a gallon or 6.4 oz for 5 gallons ?
    Just wondering.

  7. Reel, you are right. But, except for some old outboards that require more oil, they should all be run 50:1. For a while some manufacturers claimed their motors could run on 100:1, and they could. But, it's since been learned that 100:1 doesn't provide adequate protection during storage. Without that protective coating, internal parts can rust and cause failure.