Add Sta-bil to gas or not? - SailNet Community
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post #1 of 60 Old 06-19-2014 Thread Starter
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Add Sta-bil to gas or not?

I read an article that stated it was good practice to add Sta-bil (the marine kind (blue) ) to every tank of gas. My question is if this is good practice when using gasoline that already contains ethanol at the pump?
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post #2 of 60 Old 06-19-2014
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Re: Add Sta-bil to gas or not?

every tank full?

on diesels that arent used much I have done it

on my old atomic 4 and gas engines I used seafoam anytime I left the boat for more than a few months or if I felt the neeed to a little cleaning

cant remember the last time if the gas had ethanol or not...probably did since it was in california.

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post #3 of 60 Old 06-19-2014
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Re: Add Sta-bil to gas or not?

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Originally Posted by Shortnsalty View Post
I read an article that stated it was good practice to add Sta-bil (the marine kind (blue) ) to every tank of gas. My question is if this is good practice when using gasoline that already contains ethanol at the pump?
I was under the impression that Sta-bil was used to keep the ethanol from breaking down. If you expect the gasoline to sit for a long period (more than 30 days) you add it to the gas.
I could be wrong

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post #4 of 60 Old 06-19-2014
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Re: Add Sta-bil to gas or not?

Sta-bil to my understanding does nothing to preserve gas. It cleans corrosion. Gas not vented to the air will last 10+ months. I have used Sea foam, great stuff for top end lub for my L head engine. Since the lack of lead in gas I use Marvel Mystery oil in my gas every time I add gas.
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Re: Add Sta-bil to gas or not?

yup per moyer marine...works well on other gas engines too not just the atomic 4.


Im a huge fan of seafoam but I will say this everyday use and maintenance is what works best for any engine

sometimes though you cant so I would vote for a splash of seafoam.

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Re: Add Sta-bil to gas or not?

Gasoline that is not vented to the air and stored out of sunlight has an indefinite storage life. That includes E10... The US army did research on this, I will see if I can dig up the document.

Personally I think Sta-bil is "Snake-Oil" and does little to nothing to preserve gasoline. This is just my opinion, but I do own a small engine repair shop and repair 100s of engines a year. Many with gummed carbs, lots where Sta-bil was used.

In all my equipment, I don't use any chemicals. Instead I just run the carb dry (turn off fuel valve) and ensure that all vents are closed at the end of my session. This traps the gasoline in a sealed container (the fuel tank) and keeps it from oxidizing or absorbing water. Works for me, I have never had an issue in any or my personal equipment using this process (some equipment stored for over a year). I also routinely burn E10 as I can't find anything else around here.
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post #7 of 60 Old 06-19-2014
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Re: Add Sta-bil to gas or not?

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Personally I think Sta-bil is "Snake-Oil" and does little to nothing to preserve gasoline. This is just my opinion, but I do own a small engine repair shop and repair 100s of engines a year. Many with gummed carbs, lots where Sta-bil was used.
I used to have a cabin in the woods. I didn't use the generator very often but if I didn't put stabil at double the normal dosage in thye gas, the gennie would never start when I needed it.

If I did, it would start like a charm. And it was protected from light and in a sealed air tight tank.

I can not run the lawn mower from November to May, but when I go to start it up, it never fails to start.

Read that as you want.
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Re: Add Sta-bil to gas or not?

Sta-bil works and works well(for me). I have used it on stored vehicles for years, especially vehicles with carbs, like my motorcycle, lawn mower and generators. I had issues with my fuel on Alberg and started using it in conjunction with Marvel mystery( recommended by just about every A4 user) and it has definitely helped. My ethanol unleaded would start to go bad in just 3 weeks. After adding Sta-Bil i have gone as much as 4 months. My boat sat up for 4 months while I was in Afghanistan a few years ago. I added Sta-bil to fuel and ran it through carb before leaving, came back 4 months later she started up on first try.
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Re: Add Sta-bil to gas or not?

There is a newer formula of Stabil that is designed for the ethanol containing gas. By the way the ethanol is the biggest problem so it more the reason to use it, not the excuse to not use it. I don't really have any experience with it. I don't know of any way to prevent air from mixing with gas as most fuel tanks are vented.
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post #10 of 60 Old 06-19-2014
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Re: Add Sta-bil to gas or not?

Ethanol attracts moisture in gasoline, that's the main problem with it. A lot of boaters around here won't use ethanol gas because of all the problems everyone seems to have with it, especially four stroke outboards it seems. Stabil helps a lot and I never fill a can without adding it first.

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