Re: Best way to decarbonize an HPDI???
I was unaware you ever had to decarbonize a modern outboard motor. I've used good ole WallyWorld house brand of outboard motor oil for the past 26 years in my Yamaha 115 hp motor without incident. After 15 years use in a Seadoo, the head of my PWW was as clean as it could be using the same oil.