I use about 3/4-1 ounce of MMO to one gallon of gas in my 1250 Nightmare. I also use an ounce of StaBil per gallon of gasoline. A good friend, who is a small engine mechanic claims that we need a bit of upper cylinder lubricant to replace the lead that was once in the gas when our Kohlers were built. (sounds good to me) I don't notice any smoke with the MMO in the gas, the engine runs great, the spark plug is very clean and is wearing evenly, and I don't need to drain the gas when the machine is parked in the winter.
I started with 4 ounces per gallon, and that was way too much. the one ounce cleaned up the exhaust and made the engine run better. I am sold on the practice.
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