How much Marine PRO for outboard maintenance [SOLVED]

Thanks for the question, Larry. I’d simply add a full can (20 oz) to every tank. That amount will work very well to keep your outboard running clean and your fuel stabilized. At a minimum, use 1 oz of Marine PRO for every 1.5 gallons of fuel.

If you want to run a cleaning dosage every once in a while, add a full can to a low tank (about 1-2 gallons) and run it until almost empty before refueling.