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Stabil vs Stabil Marine vs Nothing

Old 08-24-2019, 06:18 AM
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Default Stabil vs Stabil Marine vs Nothing

I only put Rec-90 in my boat, but still just had to clean a massive amount of gum from my carbs (and they were last cleaned 2 years ago).

1. Will adding Stabil every fill up prevent this gum build up?
2. And if so...if I'm not using ethanol gas, is there any reason to pay 150% more for "Stabil Marine"?
Old 08-24-2019, 06:48 AM
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I was advised by a 5 star certified Yamaha mechanic to use Stabilizer and not necessarily made by Yamaha for my '19 F150 due to ethanol gas.
Old 08-24-2019, 06:52 AM
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Originally Posted by Seon View Post
I was advised by a 5 star certified Yamaha mechanic to use Stabilizer and not necessarily made by Yamaha for my '19 F150 due to ethanol gas.
Yeah, but as I stated, I never use ethanol gas.

On a related note, the little Briggs & Stratton engine on my dive hookah got fouled up too. And Brownie told me I need to use Stabil even with ethanol free gas nowadays.
Old 08-24-2019, 07:12 AM
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How often do you run your motor? The only time Iíve had carb problems while using Rec 90 is if the boat sits a long time without use, and without stabilizer. If you use red Stabil (non marine version), and run the motor on the hose every month or so to get fresh gas in the carbs, then the gas will last at least a year and your carbs wonít get gummed up. BTW, Iíve seen fewer problems with fuel injected motors sitting idle...gas evaporating in the carb bowl seems to be the problem.

If youíre running the boat frequently and refilling the tank often, you wonít need additives. I use Stabil red anyway as I donít always know how long the gas will sit (large tank, efficient boat)...but if you run it a lot you shouldnít need anything.

I think the Stabil marine is a waste of money. It is not an adequate dosage for long term storage of gas if used as directed, and way too expensive to use at a dosage that will allow for long term storage. In my opinion itís trying to fix something thatís not broke, especially if youíre using non ethanol fuel.
Old 08-24-2019, 07:14 AM
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the difference between the sta-bil versions has been discussed many times before on THT if you search

i am not sure why you would need stabilizer for non-ethanol fuel unless you are storing it?

i have never added anything to ethanol fuel, non-ethanol fuel, diesel, etc for normal use, reason being, because the engine manufacturers will simply say follow our manual, and their manuals rarely indicate adding anything to the fuel except for storage
Old 08-24-2019, 07:25 AM
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I use stabil marine every winter with a full tank of fuel, no problems so far.
Old 08-24-2019, 07:26 AM
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Sounds like you have perfect excuse to use your boat more. Plenty of threads on stabil, Seafoam, snake oils. Search is your friend.
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Old 08-24-2019, 07:45 AM
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Yes it will help mitigate gum and varnish. Use in combination with Ring Free. StarTron is another option.

Old 08-24-2019, 08:10 AM
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I use non e with Valve Tech I buy my fuel at the gas dock. I have g2 300s and troll 3-5hrs at a time alternating engines never had a problem going back to 2002 (1st year for g2). I had a 225 Yamaha 4s and did the same type of fishing and used same type fuel with ring free and had no problem, the boat is stored 5+ months for the winter with no additional addatives
Old 08-24-2019, 08:21 AM
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Originally Posted by richeerich View Post
Sounds like you have perfect excuse to use your boat more.
It probably gets run 4-5 days a week
Old 08-24-2019, 08:41 AM
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I use only non-ethanol fuel and still use Startron in my boat and anything else that will sit awhile. Not saying Startron is the one you should use but any are relatively inexpensive and if they work you get the benefit for a small price. If they don't work as advertised no big deal since they're not causing any damage.
Old 08-24-2019, 09:36 AM
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Originally Posted by NOMI View Post
It probably gets run 4-5 days a week
if you run your boat that much you donít need to add anything but gasoline to your tank
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Old 08-24-2019, 09:56 AM
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Originally Posted by NOMI View Post
It probably gets run 4-5 days a week
not sure how youíre getting gummed up then. Something else because fuel doesnít behave like that when fresh. Maybe change fuel station? Fuel might be stale to begin with.

Also, 4-5 days a week but are you going thru fuel or just 5-10 minute cruises?

Last edited by richeerich; 08-24-2019 at 10:02 AM.
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Old 08-24-2019, 10:02 AM
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Originally Posted by richeerich View Post

not sure how youíre getting gummed up then. Something else because fuel doesnít behave like that when fresh. Maybe change fuel station? Fuel might be stale to begin with.
Yeah that was a suspicion of mine. Maybe I got a bad batch. I do usually fill up about 50gal of jugs at a time. It's just a 50hp, but i fish enough that i burn thru that fuel in 2weeks to 2 months (max).

My other suspicion is condensation in the plastic 6 gal tanks (thru the vent?).
Old 08-24-2019, 10:23 AM
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If you'd like to learn a bit more about the different additives used for different purposes, Google the MSDS for the product you are interested in. You may find some similarities in some of the main ingredients.
For example...fuel stabilizers usually use Naptha as the main ingredient to keep gasoline from losing the lighter ends from evaporating out of the solution, which are more volatile.
Fuel system cleaners use Alcohols, since they are excellent solvents. Since they are polar solvents, they are also used to "dry" fuel of water buy allowing water to mix with the petroleum fuel.
The better de-carbon products use PEA, Poly Ether Amine, to break the carbon bond. red-line SL-1, Lucas, Regaine, etc.
Look it up and read about Seafoam, Ring Free, Marvel Mystery oil, Techron additives, Lucas, Stabil and others.
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Old 08-24-2019, 10:34 AM
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I use non ethanol only , store w sea foam and /or StarTron. Iíve had to clean my carb every other year. I wonder if non ethanol rec gas lacks additives? I noticed my fire retardant gets sooty pretty quick too.

Thereís so much info on additives Iím confused on the difference between StarTron, Sea foam, Stabil, etc.
Old 08-24-2019, 10:57 AM
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Ok, here's some info about Stabil.
MSDS: Stabil-Fuel-Stabilizer1.pdf
Notice the isoparaffin HFP being 95% of the formula.

Here's HFP distillate. https://www.pcansw.org.au/docs/gener...lates_hfp.docx
The synonym is Naptha, BBQ lighter fluid, etc. It's like Kerosene.

The secret additive I use is Saskatchewan Seal Skin Solvent. Say that fast three times with a lithp. Who actually tried to say it...? Saskatchewan Seals are quite rare, so the product is quite expensive. It's kinda like Marvel Mystery oil....it's a mystery.

Some of you know me buy now...ain't I a stinker?
When is he serious and when is he pulling my leg?

Old 08-24-2019, 01:30 PM
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The naptha (or similar equivalent) contained in fuel stabilizers are just a carrier to keep the active ingredients in solution. The active ingredients are anti-oxidants, metal deactivators, and detergents. If they replace some of the high volatility components lost by gasoline during storage, the effect is largely incidental.
Old 09-21-2020, 07:46 AM
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There seems to be so much uncertainty regarding if stabilizers even work. I know I'm tempted to use them when I get my new boat, just for cheap insurance. I recently saw a Youtube video that showed corrosion even when a stabilizer was used with 10% Ethanol gasoline. I think best practice is to use non-Ethanol gasoline whenever possible. I'm sure running your engine regularly (at least once every one or two weeks?) will surely help.

The user manual for my home generator recommends starting the engine every week, and once warm shutting off the fuel flow to run engine dry of fuel (instead of just shutting off the engine). Does anyone recommend doing this (starving engine of fuel) with a 4-stroke outboard boat engine to help with corrosion? Does this practice hurt the engine? I suspect it's more work (priming the engine) to get it going every time.
Old 09-21-2020, 08:05 AM
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on my older 2 stroke which I sold over a year ago. i just filled up the tank and ran it. No additives, used closest gas station which only sold ethanol based fuel.
ran it from 2004 till last year when i sold it and there were never any problems with engine. i did have to replace a lower unit though since i ran through a solid pipe at 40mph.

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