I use 89 octane and never add any octane booster and have had no problems. My layup period is only 4-5 months anyway and even if it went down to 86 or 87 the manual says my four stroke is happy with that octane rating. I've been told in the past that the 2 strokes need a higher octane than the fours. I do use a fuel stabilizer though.danielb":zpk5kn93 said:Does anyone ad octane additive to the gas that has been stabilized but has sat for three for four months?
I have never had a problem. My routine is to run stabilized gas for the month of November, fill the tank and ad the right amount of stabilizer and that's it. Ran the tank down in the spring and re filled.
But, how much octane is lost by sittiing-I put in 89 octane before layup?
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