There has been a lot of debate about that on this site. I have been using 10% in my older equipment for years and haven't had a problem yet. Some claim it is hard on the carb parts and I disagree. I have a 1962 JD 95 combine and all that's had in the last 10 years is 10%, never touched the motor. I think it is okay but may effect some engines. Haven't found one yet.
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