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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!

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

    BMF
     
  2. dip

    dip dip

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    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.

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  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.
    J
     
  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.

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  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.