Okay I have a 15hp. Johnson mid 80's and no issues!! I want to keep it that way, I see many people who need carb rebuilds no matter the engine size. So is it a good idea to add a fuel additive to prevent the jets from getting varnished up? I know ethanol can ruin carb seals and I try to make every attempt to use gas that has no ethanol. In the fall I usually disconnect the fuel line and run it dry when putting the motor away for winter, so any advice on this and the use of fuel additives would be welcome!!