Shelf Life of Super vs Regular Unleaded Fuel?
Thread Starter
Junior Member
Joined: Oct 2007
Posts: 97
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From: Shoreline East Haven, Connecticut
Car: '92 Z28
Engine: 350 TPI L98
Transmission: 700R4
Axle/Gears: 10 Bolt / 3.23
Shelf Life of Super vs Regular Unleaded Fuel?
The longer my 305 TPI waits for weekend wrenching action, I get the doom and gloom feeling that the full tank of super unleaded I topped off way back in late June is going extremely stale I assume.
I did not use Stabil Fuel treatment like I read all about in magazines or TV commercials thinking that super unleaded I purchased at Sunoco will last longer than regular unleaded I can buy at HESS locally.
So what do you guys think? Should I just dump the new bottle of Stabil in my tank now or siphon off the super unleaded and use it for parts washing?
Also, can you guys PLEASE recommend a good fuel siphoner? Autozone sells one that is hand operated so I guess I'll be purchasing that as well but I am one to try new devices found off the net to make life a bit simpler.
Thanks a bunch !
I did not use Stabil Fuel treatment like I read all about in magazines or TV commercials thinking that super unleaded I purchased at Sunoco will last longer than regular unleaded I can buy at HESS locally.
So what do you guys think? Should I just dump the new bottle of Stabil in my tank now or siphon off the super unleaded and use it for parts washing?

Also, can you guys PLEASE recommend a good fuel siphoner? Autozone sells one that is hand operated so I guess I'll be purchasing that as well but I am one to try new devices found off the net to make life a bit simpler.
Thanks a bunch !
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Joined: Aug 2007
Posts: 2,529
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From: Fairhope, AL
Car: 89RS(other cars & pics in vBgarage)
Engine: LO3, 305 TBI Mildly Modified
Transmission: BakerBuilt 700R4 w/B&M Megashifter
Axle/Gears: 3.23 Auburn Pro Series LSD
Re: Shelf Life of Super vs Regular Unleaded Fuel?
its good
gas that sat in a crown vic for 4 years, started right up
8+ of about 10 gallons freshened up with 5 new in a 70's dodge 440
3 years in a dodge van
7 years in a chevy 454
all of them started and ran, but they also got a good dose of injector cleaner with the first fresh tank of gas
if its just june of 09 fire that puppy up and do a burn out it will be fine
if its been over a year than you may want to take it out and put in some fresh but thats 4 i personaly seen or did myself that didnt have any issues
best siphon tool..........an old 12V fuel pump or a $30 in line 12V fuel pump, its what most all mechanics use
gas that sat in a crown vic for 4 years, started right up
8+ of about 10 gallons freshened up with 5 new in a 70's dodge 440
3 years in a dodge van
7 years in a chevy 454
all of them started and ran, but they also got a good dose of injector cleaner with the first fresh tank of gas
if its just june of 09 fire that puppy up and do a burn out it will be fine
if its been over a year than you may want to take it out and put in some fresh but thats 4 i personaly seen or did myself that didnt have any issues
best siphon tool..........an old 12V fuel pump or a $30 in line 12V fuel pump, its what most all mechanics use
Last edited by 89RS_82Z; Sep 22, 2009 at 09:57 PM.
Senior Member
Joined: May 2008
Posts: 833
Likes: 0
From: London, Ont, Canada
Car: 87 T-Top GTA
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: Shelf Life of Super vs Regular Unleaded Fuel?
At Home Depot in the plumbing section you can get a tool that plumbers use to drain out small tanks, toilets, pipes,etc.....it attaches to a normal drill and can flow/drain in both directions. $15-20 cdn.....so in US$.....$5-10.
But your gas should be fine, Just like 82RS_82Z said.

But your gas should be fine, Just like 82RS_82Z said.
Thread Starter
Junior Member
Joined: Oct 2007
Posts: 97
Likes: 0
From: Shoreline East Haven, Connecticut
Car: '92 Z28
Engine: 350 TPI L98
Transmission: 700R4
Axle/Gears: 10 Bolt / 3.23
Re: Shelf Life of Super vs Regular Unleaded Fuel?
Sounds good to me so far but I get concerned about the notorious fuel additives such as MTBE ( a cancer causing carcinogen ) they add here for some green emission reason here in the Northeast. I bet they don't add that stuff down in Alabama versus Connecticut do they? I thought I'd throw this in to the question to nail the shelf life of Super or Regular. You guys run an ethanol mix probably better than ours. I guess I am being overly cautious here but YOU guys have the experience!This ultimately leads me to my fuel siphon question: Is the June stash of super unleaded in my '88 IROC safe or wise to use into my '96 3.8L Camaro? I intended to put each Camaro drivers side to feed off the other.
I just don't want to cause any extra problems in the future so I'm brainstorming in advance.
Thread Starter
Junior Member
Joined: Oct 2007
Posts: 97
Likes: 0
From: Shoreline East Haven, Connecticut
Car: '92 Z28
Engine: 350 TPI L98
Transmission: 700R4
Axle/Gears: 10 Bolt / 3.23
Re: Shelf Life of Super vs Regular Unleaded Fuel?
At Home Depot in the plumbing section you can get a tool that plumbers use to drain out small tanks, toilets, pipes,etc.....it attaches to a normal drill and can flow/drain in both directions. $15-20 cdn.....so in US$.....$5-10.
But your gas should be fine, Just like 82RS_82Z said.

But your gas should be fine, Just like 82RS_82Z said.
So far the consensus is old gas is good gas.
Supreme Member
iTrader: (2)
Joined: Aug 2007
Posts: 2,529
Likes: 1
From: Fairhope, AL
Car: 89RS(other cars & pics in vBgarage)
Engine: LO3, 305 TBI Mildly Modified
Transmission: BakerBuilt 700R4 w/B&M Megashifter
Axle/Gears: 3.23 Auburn Pro Series LSD
Re: Shelf Life of Super vs Regular Unleaded Fuel?
we got MTBE here
hopefully you will get a few more posts but i honestly think it will be ok, my maro sat for 6 months back last year and started right up and ran fine had super in it
all the cars i mentioned had pre 2002 gas in them, if it makes a diff i dont know.....all 87 octane to
hopefully you will get a few more posts but i honestly think it will be ok, my maro sat for 6 months back last year and started right up and ran fine had super in it
all the cars i mentioned had pre 2002 gas in them, if it makes a diff i dont know.....all 87 octane to
Senior Member
Joined: May 2008
Posts: 833
Likes: 0
From: London, Ont, Canada
Car: 87 T-Top GTA
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: Shelf Life of Super vs Regular Unleaded Fuel?
Every winter I alway intend to use Stabil, but I always forget(all 9 years now). The car sits for 5 months in my garage. The FULL tank of gas I left it over the winter just seems too burn off quicker in the spring. No harm that I can see. Within the first few drives into the 2nd tank and the car is just rippin down the road just fine!!!
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Senior Member
iTrader: (1)
Joined: Jul 2007
Posts: 1,141
Likes: 2
From: MA
Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: Shelf Life of Super vs Regular Unleaded Fuel?
I thought MTBE was replaced by E10 because of water contamination? That stuff goes bad even faster. I'd definitely put Stabil in it. Nothing like clogged injectors to ruin your day.
Senior Member
Joined: May 2008
Posts: 833
Likes: 0
From: London, Ont, Canada
Car: 87 T-Top GTA
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: Shelf Life of Super vs Regular Unleaded Fuel?
Sunoco 94 ethenol mix here! And thats what has been left inside all 9 winters.
I use inj. cleaner in the 2nd tank.
I use inj. cleaner in the 2nd tank.
Member
Joined: Apr 2007
Posts: 365
Likes: 0
From: Winnipeg, MB, Canada
Car: 1984 Camaro Z28 T-tops
Engine: 350
Transmission: T-5
Axle/Gears: 3.23
Re: Shelf Life of Super vs Regular Unleaded Fuel?
I wouldn't worry about old gas. My 305 always fired up with gas between 6 and 12 months old... And once a gallon from a truck that sat for over 2 years, just filtered the grit out before adding it to the tank. :P
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