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I can vouch for it. I have monitored my fuel systems since some ethanol/MTBE damage 2-years ago. Stabil works and now Yamaha has stabilizer in their RIngfree product.
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2002 Sailfish 236 with Yamaha 200 HPDI
I imagine you're talking Marine Stabil for ethanol protection.
The standard Stabil is well documented to be an effective gasoline stabilizer. But the ethanol stuff is just ??????
Many threads on this topic. Use the search function for days of reading on ethanol treatment. Consensus seems to be "I dont know but I aint willing to risk not using it!"
FIL had a boat with DT140 Suzuki, used very little, fuel might be as much as 9 months old, carb problems almost every year for 7 years. I got the boat and started using Stabil religiously. That was 7 years ago and no (zero) carb or fuel related problems since. I never had 9 month fuel, but plenty of 6 or 7 months ...
Star Tron is what I use for storing my fuel in the winter as well as during the seasonal use. I have not had any problems with using it and not going to try not using it. Gotta love E10 gas
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2006 Sea Hunt 220 Escape DC with F225 Yamaha
We had a hurricane "Rita" and "Ike" here a few years back. I had 200 gals. in my Sea Cat. It sat for 14 months with Stabil treatment in it. All 200 gals. ran smooth just like fresh fuel,no carb issues are anything. That convinced me on the merit's of Satbil..Good Chit!
I have a 2006 Lowe pontoon boat with a 30 gal tank. In June 06 when I bought the boat I filled the tank and added Stabil as directed on the bottle. I have never used all of that fuel. I may use the boat for a hour every 5-6 months and I add more fuel with the proper amount of Stabil when I down about 5 gal. I can go to the boat right now, pump the bulb 3-4 times and the 06 Merc 60 Bigfoot fires right up and will rum WOTas smooth as it did when new. I believe in Stabil and now use the marine formula.
Wouldn't know, Stabil works as advertised for me so I have no need to experiment with 'other stuff'. Hard to improve on something that does exactly what I need, and does it well ...
Back in my younger and less informed days, I would let lawn equipment fuel sit over the winter and not drain the bowls & carbs in the mowers. Of course I had stale fuel problems. A few carb rebuilds later, I tried stabil. Did not have a boat then so I can't comment on how an outboard would have fared.
Have not had a single issue in my lawn equipment since I started using red stabil many years back. When the blue marine/ethonol stabil came out I switched over to it for all my fuel including the mowers. Pump gas is all going to have ethonol in it around where I live.
The marine version is actually cheaper per gallon of treated fuel then the old style red too. Every drop of fuel I buy for lawn equipment or either of my two gasoline boats has marine stable in it at the time the fuel is pumped. I have not had a fuel related problem in either outboard either (unless you count the time the fuel pickup tube came off the barb inside the tank on my smaller boat - good thing I had a 2nd pony tank on board that day, of course this has nothing to do with stabil ).
For the past several years my winterization no longer includes draining the tanks. Just double treat with marine stabil and good to go for a few months.