I’ve had a Yamaha F60 since 2012. Use non-ethanol gas only and pour a can of sea foam in the tank first thing every year. No issues at all.
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My dealer salesman/owner told me to use mercury products when i asked (was my first 4s), and said to not use seafoam. While talking to the mechanic in the back about a few rigging things i wanted done, i asked him the same question and he said merc only recommends mercury/quicksilver products. I said "what do YOU suggest" and he said "i use seafoam in all of my boats". That kinda told me what i suspected, that mercury tells their dealers/techs to only recommend merc additives.
I had my motor in for servicing two years ago at a different shop (merc certified) and i first told them I use seafoam to keep the engine clean because i burn a tank a year in our idle only lakes, and asked if there was anything else i should use. He walked me over to his desk and showed me all kinds of info on the Mercury products, told me none would interfere/react with seafoam, and suggested the quikleen because all the idling and older gas can cause some buildup in the fuel system/injectors and seafoam isnt the best at that sort of stuff, only combustion related carbon.
He also suggested the stabilizer but i really havent ever had issues with our non eth gas lasting the season.
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I’ve had a Yamaha F60 since 2012. Use non-ethanol gas only and pour a can of sea foam in the tank first thing every year. No issues at all.
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I use Seafoam Mercury 115 hp
I’ve had and currently have DF Suzuki 4 strokes since 2007 they’ve all ran on e10 no additives with zero problems,just fill em and go.