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4 Stroke Outboard - Fuel Additive - Ethanol Free Gas

Old 10-21-2019, 12:22 PM
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Default 4 Stroke Outboard - Fuel Additive - Ethanol Free Gas

I have been reading quite a bit about what to put in my boat's gas tank.
I have seen some use the Yamaha Ring Free Plus every other tank fill up, and other people use the Sta-Bil (360 Marine - not the storage option).

I am conflicted and need some advice for my set-up.

Live in the midwest - have harsh winters or a stretch of 40-50+ degree days during the peek winter months.
Use ONLY ethanol free gas 100% of the time - (confirmed with marina that they do NOT use any form of fuel stabilizers in the fuel).
Mercury 4-stroke 90 horsepower engine (using on a pontoon).
~33 gallon tank

I plan on sometimes using the boat during the fall/winter if the weather allows.

What do you recommend I use as a fuel additive - and the frequency?
I don't mind spending the extra money to use the Yamaha Ring Free Plus if it is needed.

Thanks for the help!
Old 10-21-2019, 01:00 PM
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If 100 percent ethanol free, I would not use any additive except for long term storage, then it would be Stabil.
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Old 10-21-2019, 01:06 PM
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I use SeaFoam in all my engines that might be laid up for a time (live in the Denver), have never had a fuel related issue in the spring. Not saying its the best additive just that it works for me.
Old 10-21-2019, 02:11 PM
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I wouldn't add anything. Haven't in 12 years, no issues. Boat in shed for 6 months of winter. All this stuff is snake oil IMHO.
Old 10-21-2019, 02:15 PM
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Originally Posted by Kack View Post
I wouldn't add anything. Haven't in 12 years, no issues. Boat in shed for 6 months of winter. All this stuff is snake oil IMHO.
Kack....please don't say that ..you will literately put millions of people out of work in the additives market....LOL
Old 10-21-2019, 03:47 PM
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To me, it's not needed if you run the tank down quickly enough between fill-ups. But it won't harm anything, and it will slow the buildup of varnish & carbon. It won't prevent buildup totally imo, but it will slow it down.
Old 10-21-2019, 05:22 PM
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Sta-bil marine 360
Old 10-21-2019, 05:29 PM
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Sta-bil if anything.
Old 10-21-2019, 07:00 PM
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If kept in an insulated shed that doesn’t change temp fast and you keep the tank full I don’t think it is as important. I like to fill the last tank with premium gas.
Stabil 360 marine says it’s for ethanol fuel... but my previous owner was using it so I have since that is what he used even thought I buy ethanol free. Stabil was always marketed for fuel storage.
i generally use seafoam. Good as long as your fuel system is clean.... if not it can break deposits loose and cause issues...so it will actually clean your fuel system. I run a little in all my small engines because some don’t get used that often. I don’t use in diesels nor engine oil. My old trusty mechanic recommended seafoam for small engines with carburetors, his son isn’t a fan but he is a diesel mechanic and has seen people mess up injectors.
I have never used startron or chevron Techron.
Old 10-23-2019, 03:11 PM
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Thanks for all of the feedback.
The boat is kept outside in dry storage (October - March) when not in the marina boat slip.
Old 10-24-2019, 06:01 AM
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I lived in Kansas for 9 years, Waters hard as a rock for 3-4 months every winter. Never used any additives and never had an issue.
Old 10-24-2019, 06:12 AM
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Sta-Bil vs. Sea Foam/Ring Free is like comparing apples to oranges.

Sea Foam as normal treatment during summer, plus Sta-Bil for winter storage.
Old 10-30-2019, 12:35 PM
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Originally Posted by kdenap View Post
Kack....please don't say that ..you will literately put millions of people out of work in the additives market....LOL

I think it's just one guy at a gas pump with some trans fluid, some two stroke oil and some food coloring filling up a bunch of little different shaped clear bottles and sticking different labels on them. That guy is rich as balls. I'm jealous
Old 10-30-2019, 01:41 PM
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Project Farm on YouTube has a lot of good videos on fuel and fuel treatment products.
https://m.youtube.com/watch?v=bEf9Fd...fauxfullscreen
Old 10-30-2019, 01:59 PM
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Originally Posted by firefight1981 View Post
I have been reading quite a bit about what to put in my boat's gas tank.
I have seen some use the Yamaha Ring Free Plus every other tank fill up, and other people use the Sta-Bil (360 Marine - not the storage option).

I am conflicted and need some advice for my set-up.

Live in the midwest - have harsh winters or a stretch of 40-50+ degree days during the peek winter months.
Use ONLY ethanol free gas 100% of the time - (confirmed with marina that they do NOT use any form of fuel stabilizers in the fuel).
Mercury 4-stroke 90 horsepower engine (using on a pontoon).
~33 gallon tank

I plan on sometimes using the boat during the fall/winter if the weather allows.

What do you recommend I use as a fuel additive - and the frequency?
I don't mind spending the extra money to use the Yamaha Ring Free Plus if it is needed.

Thanks for the help!
1) I don't use ringfree
2) I don't add ANYTHING to the gas
3) The gas sits there all winter
4) I use ethanol
5) I've been doing this for 15 years now with no issues.
Old 10-30-2019, 02:43 PM
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^^^ same story in FL. YRMV some motors seem to more commonly have fuel issues then others.

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