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How long does ethanol free gas last? #5339491 02/02/20 07:56 PM
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Chris142 Offline OP
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The gas in my Can am has been in there since august. Even with a double dose of stabil 360 it still went rank. All I can get is E10 but I can buy race gas in 5g cans. Wondering how long the ethanol free race gas lasts.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: How long does ethanol free gas last? [Re: Chris142] #5339503 02/02/20 08:04 PM
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atikovi Offline
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Is that carburated? No idea but if the tank isn't sealed, I can imagine it oxidizes somewhat. I've had 4,5 even 8 year old E10 in the tanks of cars that still ran fine but they are fuel injected.

Re: How long does ethanol free gas last? [Re: atikovi] #5339506 02/02/20 08:07 PM
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Originally Posted by atikovi
Is that carburated? No idea but if the tank isn't sealed, I can imagine it oxidizes somewhat. I've had 4,5 even 8 year old E10 in the tanks of cars that still ran fine but they are fuel injected.


Ive not gone that long but I can have 6-12 month old gas in my truck.

In OPE, depending upon how the fall shapes up with timing of buying gas and how many times I need to mow/blow, its quite likely that a tank will go from Sept-May. Never had an issue with it going bad.

Re: How long does ethanol free gas last? [Re: atikovi] #5339521 02/02/20 08:19 PM
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Chris142 Offline OP
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Originally Posted by atikovi
Is that carburated? No idea but if the tank isn't sealed, I can imagine it oxidizes somewhat. I've had 4,5 even 8 year old E10 in the tanks of cars that still ran fine but they are fuel injected.

Fuel injected


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: How long does ethanol free gas last? [Re: Chris142] #5339545 02/02/20 08:49 PM
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i wonder if this may answer the question

https://trufuel50.com/about/

Last edited by WhyMe; 02/02/20 08:50 PM.
Re: How long does ethanol free gas last? [Re: atikovi] #5339588 02/02/20 10:01 PM
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Chris142 Offline OP
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Originally Posted by atikovi
if the tank isn't sealed, I can imagine it oxidizes somewhat. .

The gas tank is sealed. The utv has a charcoal emissions canister just like a car. Our califilornia gas is just junk.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: How long does ethanol free gas last? [Re: Chris142] #5339605 02/02/20 10:24 PM
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I wish I could answer your question, but it obviously doesn't take too long. Just yesterday, I was in my shop and saw the weed wacker sitting there. On a whim, I gave it a couple of pulls (more than normal), and I got it to run.
But it actually ran terrible. I didn't run it too long, but I'm pretty sure it was from stale gas. I buy alcohol-free gas for my lawn equipment and I purchased this gas at the end of summer last year.
Next weekend I'll have more time and I'm going to burn all the old gas out of it.

Last edited by Kruse; 02/02/20 10:25 PM. Reason: spelling
Re: How long does ethanol free gas last? [Re: Chris142] #5339618 02/02/20 10:45 PM
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I have the same problem you do and I run E0 only in my power equipment.I have started using 100LL AVGAS in my 2 stroke equipment all the time and use it to flush out my mowers and 4wheelers when they are put away for the winter.The guy at the airport claims it's good for 10 years but I take that with a grain of salt.Even the pump E0 is only lasting 3-4 months before going stale in my experience.I tried Stabil ,Seafoam,Marvel ,etc with no luck.I did have some saw gas to last thru the winter with echo oil in it,had a can of straight gas beside it .The straight gas was stale ,both were bought at the same time.After seeing that ,I began using a 2.6 oz of 50:1 oil in 5 gal of gas all the time during season then flush in winter with the 100LL.I would expect racing fuel would last as long as AVGAS.It is about $3 per gal higher than AVGAS here.

Re: How long does ethanol free gas last? [Re: Chris142] #5339656 02/03/20 12:15 AM
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user52165 Offline
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Originally Posted by Chris142
The gas in my Can am has been in there since august. Even with a double dose of stabil 360 it still went rank. All I can get is E10 but I can buy race gas in 5g cans. Wondering how long the ethanol free race gas lasts.


You realize that 5 gallons will cost about $50 in the PRC?

And the seller is required to keep records of the purchase?

For future inspection by the STATE?

Last edited by user52165; 02/03/20 12:19 AM.

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy. It's inherent virtue is the equal sharing of misery.

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Re: How long does ethanol free gas last? [Re: Chris142] #5339709 02/03/20 05:10 AM
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shanneba Offline
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Originally Posted by Chris142
All I can get is E10 but I can buy race gas in 5g cans. Wondering how long the ethanol free race gas lasts.



https://www.sunocoracefuels.com/tech-article/storing-vintage-collector-muscle-cars

We’ve heard stories about cars that were originally filled with Sunoco race fuel that started and ran without draining the fuel – decades later!
We don’t suggest that those stories are typical, but we do know that our fuels will last a long time when properly handled.


https://www.sunocoracefuels.com/tech-article/octane-stability-high-octane-vs-low-octane-fuels

The components used in Sunoco race fuels are very stable and can retain octane in excess of 2 years when properly stored.

87 octane fuels tend to be less refined and contain more unstable hydrocarbons.
As the months pass during storage these unstable components react to form gums,
varnishes and lower octane hydrocarbons.
As a result the octane can decrease within months for 87 octane fuels, especially when stored under less than ideal conditions.
93 octane fuels are more refined and contain more stable hydrocarbons. These stable hydrocarbons can last 2-3 times longer than 87 octane fuel.
Even in proper storage 87 octane gas can start to degrade in 3 months, 93 octane fuel should last closer to 9 months before degradation is noticeable.

Last edited by shanneba; 02/03/20 05:11 AM.

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Re: How long does ethanol free gas last? [Re: Chris142] #5339725 02/03/20 05:58 AM
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So my local Stewarts (a quick shop that is known for milk & ice cream, especially the Death by Chocolate) sells E0 gas at 93 octane. What is the difference between that and Sunoco race fuels?


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: How long does ethanol free gas last? [Re: Donald] #5339764 02/03/20 07:12 AM
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Originally Posted by Donald
So my local Stewarts (a quick shop that is known for milk & ice cream, especially the Death by Chocolate) sells E0 gas at 93 octane. What is the difference between that and Sunoco race fuels?

Yeah Stewarts is very serious about E0 gas.


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98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
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Re: How long does ethanol free gas last? [Re: user52165] #5339767 02/03/20 07:17 AM
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Chris142 Offline OP
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Originally Posted by user52165
Originally Posted by Chris142
The gas in my Can am has been in there since august. Even with a double dose of stabil 360 it still went rank. All I can get is E10 but I can buy race gas in 5g cans. Wondering how long the ethanol free race gas lasts.


You realize that 5 gallons will cost about $50 in the PRC?


Still cheaper than my plugged up injector was.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: How long does ethanol free gas last? [Re: Chris142] #5340441 02/03/20 11:08 PM
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Ethanol free will last quite a while, 6 months+. My 2 stroke snowmobiles sit from March to December with gas in them. And that gas gets used in them, no draining. These are not stock high HP 2 stroke engines. I NEVER put stabil or seafoam or any of that crap in my fuels.

My RZR has commonly has gas in it for 4-6 months at a time before it gets used up.

BTW, you are already using E10 and you are adding more alcohol/naphatha to in by adding stabil? Thats probably why your gas is crap.

BTW AVGas is an EXCELLENT fuel. It will last a VERY long time. We use it in the very modified, high compression, high boost 2 stroke engines. Price varies greatly, but an airport near here had it for $4.19 a gallon last time we needed 50 gallons.

Last edited by Srt20; 02/03/20 11:11 PM.
Re: How long does ethanol free gas last? [Re: Chris142] #5340481 02/04/20 02:07 AM
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Things are different out here.

Ethanol free stations in CA:

https://www.pure-gas.org/index.jsp?stateprov=CA 26 stations

Ethanol free in WI:

https://www.pure-gas.org/index.jsp?stateprov=WI 960 stations

With 7 times as many people, compare the stations.

Madison, Green Bay OK, but not Milwaukee - why??

CA gas must be refined in CA, can only be sold in CA, and we cannot import any gas from other states.

Boutique formula.

And as Chris said, it's crap.

Illegal to use ethanol free for general purpose. Boats, planes, racing, off road only. And strictly enforced.

Last edited by user52165; 02/04/20 02:30 AM.

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy. It's inherent virtue is the equal sharing of misery.

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