How much Sea Foam should be used in John Deere lawn mower? [SOLVED]

Thanks for the question, Dave! For routine/preventative maintenance in a John Deere lawn mower, add 1 to 2 ounces of Sea Foam Motor Treatment per gallon of fuel. This will help clean the fuel system and prevent fuel from breaking down.

For occasional cleaning (once a year), use a higher concentration by adding a half can (4 ounces) to a small amount of fuel, like a half-gallon. Run the engine until the treated fuel is used up. This helps clean stubborn fuel residues and varnish.

If you have more questions, let me know! Happy to help.