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Good stuff Mark. I use it in the boat every other fill up. And in the truck and car about 3-4 times a year.
If you use it in your oil add about 1/2 can to a 5-6 quart oil pan about 100 miles before your oil change.
Caution though. If your internal engine is really sludged up I wouldn't do it. This stuff will loosen all the sludge and send it to the pan and plug up the pump screen.
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I use it in all my stuff! Boat,truck, car, lawnmower, weedeater, chainsaw! I also put Stabil in the gas for the boat, it doesn't hurt!
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Have had two boats both with 90 Merc two strokes and I have always used it NO ISSUES! also use it in weed eater and mower and both run great.
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The only time I had a seafoam issue is when I did not add it, per a buddy questioning me using it in my boat all the time. So that winter I didn't add it and the next spring my boat was in the shop for the first time ever getting the carb rebuilt/cleaned. I proved my point to him, but it cost me. LOL
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I use it each time I fill up the boat.