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Discussion in 'Boats and Motors' started by bmffishing247, Jul 3, 2005.
Just wondering if it would still be 50 to 1 like all other motors. any info would be great.
50:1 and my old 83 9.8 was 50:1 so i would spect your's is the same.
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.
I have a 1990 20hp mercury that is 50:1 as well.
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.
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 ?
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.