What Do You Do With Old/Bad Premixed Gas?

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12/22/2018 9:08 AM

Premix isn't gonna go bad even if left for months or years.

You guys are nuts

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12/22/2018 9:14 AM
Edited Date/Time: 12/22/2018 9:37 AM

809 wrote:

It will not hurt your truck at all. I wouldn't dump it in an empty tank, but it won't hurt anything. I had my ASE Master before I changed careers. I still work on cars if that makes you feel better about it.

dmm698 wrote:

Is your new career catalyst design and efficiency?

809 wrote:

I can explain the theory, function and where it falls short, how about you?

just a few years working with catalysts for pump fuel, and various alternative blended fuels. I'm not a certified master tech, just an engineer in powertrain but I do listen to their input. I did save 50 bucks on my car insurance by calling geico and asking the insurance agents for chemistry advice last night though.

Swing and a miss....

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9/1/2019 12:28 PM

A couple years ago I put a few gallons of old pre-mix in a 2008 express. Not sure if it was coincidence or not but a week or two later the fuel pump went. Bumping this thread cause I have about 3 gallons of old pre-mix and don't know if I want to risk that again.

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9/1/2019 2:39 PM

I don't know what type of gas you get in the States, but I have used several months old premix with no issue at all. 95 octanes (european rating) with synthetic oil.... Have not noticed any difference wassat

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9/1/2019 4:59 PM

Bon fires.

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9/1/2019 5:39 PM

Won't do it anymore in a mid 90s or newer car. Not worth the risk to the cats. I have reverted to my dads way of doing things. Weed killer, bring it on libs.

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9/1/2019 5:52 PM

sdmx wrote:

So it is OK in the car because you are mixing it with 20 gallons of straight gas, right? ...I just cringe at putting something that is not good enough for my old motorcycles into my new truck.

The lawnmower idea sounds great, but I use less than 2 gallons a year in my mower.

Not good for oxygen sensor or catalytic converter. I use it for my gen,mower,weedwacker etc.

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9/1/2019 6:31 PM

Sniff it then drink it

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9/1/2019 6:56 PM

SLOWTIME wrote:

Bon fires.

This. Accumulate your bad gas in an extra can until wintertime, then take a camping trip to the desert. I light my fires with my old gas. Write my name in the dirt and everything.

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Braaapin' aint easy.

9/2/2019 10:02 AM

Snowblower....smells awesome while I clean my driveway in the winter..

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9/2/2019 2:15 PM

I used to feed my old premix to an old Jeep , tried that in my Suburban and it cooked two sensors. Lesson learned I take it to fuel recycling center now

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9/3/2019 8:13 AM

fuel stabilizer >fuel good for months.

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9/3/2019 8:43 PM

Are you guys serious? I have ran 6 month old premixed C12 with Motul 800 in my full race KX250 and had no issues and no detonation. I do store it in the steel VP pail in between rides ... but seriously 2 weeks? And you guys believed that w00t w00t w00t

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Don’t piss off the old people - the older they get the less “life in prison” is a deterrent for them!

2020.5 KTM 450 SXF FE
2006 KX250

7/3/2020 9:41 AM

Thread bump. I have some 10month old premixed fuel, wondering if it’s same to use in the SX 250? whistling

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There may be people that have more talent than you, but there's no excuse for anyone to work harder than you do.

7/3/2020 9:48 AM

barrs211 wrote:

Thread bump. I have some 10month old premixed fuel, wondering if it’s same to use in the SX 250? whistling

I'd say if it's been in a METAL can, and not sitting on a concrete floor (tends to collect moisture), that it's OK. Pour it into a clear jug and let it sit for an hour - does it separate and can you see water "blobs" sitting in the bottom? I would not just pour it into the tank without checking it...

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7/4/2020 5:12 AM

Monk wrote:

2 weeks? I've used mix well over a month of sitting in a can... After that the rest goes to the lawnmower, pressure washer, pickup, etc...

6 months in a sealed container no worries.

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If the glass is half full it's twice as big as it needs to be.

7/4/2020 5:54 AM

Here's a practical answer for you. On your way to the track pull over on a side road and dump it out on the street. Or in some gravel. It will evaporate in less than 10 mins.

Or you can wait til the neighbors are in for the night and just walk outside and spread it across you driveway. Same thing will happen.

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7/4/2020 9:28 AM

I used to put it in my truck. Really, a 32 or 40 to 1 mixture then diluted even more when you put it into 10-20 gallons in your car isn't going to hurt anything. I only have one 2 stroke now so I don't do it as much.
Oh, 2000 F250, 6.8l 208k miles.Original cat still going.

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The older I get, the faster I was.

7/4/2020 12:00 PM

It's a solid question on what to do with the stuff. I have an old VP can containing questionable fuel that came in a used bike we bought. Our area has a hazardous waste drop-off site that takes old fuel. Bad news is that it's barely open right now due to the Covid situation.

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7/4/2020 5:13 PM
Edited Date/Time: 7/4/2020 5:21 PM

Ok. So it has been a year and a half since I started this thread. I have since bought a four stroke. Updated question - how long is non mixed gas good?

Asking because an injury has forced me to not ride for the next 6 months.

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7/5/2020 11:57 AM

sdmx wrote:

Ok. So it has been a year and a half since I started this thread. I have since bought a four stroke. Updated question - how long is non mixed gas good?

Asking because an injury has forced me to not ride for the next 6 months.

I'd get as much gas out of tank as you can. Dump whatever you have into your car. Good luck with your injury.

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The older I get, the faster I was.

7/5/2020 12:56 PM
Edited Date/Time: 7/5/2020 12:58 PM

sdmx wrote:

Ok. So it has been a year and a half since I started this thread. I have since bought a four stroke. Updated question - how long is non mixed gas good?

Asking because an injury has forced me to not ride for the next 6 months.

captmoto wrote:

I'd get as much gas out of tank as you can. Dump whatever you have into your car. Good luck with your injury.

This. Unmixed gas does not last as long as premixed.

EDIT: You could always add some stabilizer, slosh it around and start the bike up for a minute or two. Fuel-injected bikes won't have as big a problem with old gas anyway.

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Braaapin' aint easy.

7/5/2020 1:09 PM

809 wrote:

It will not hurt your truck at all. I wouldn't dump it in an empty tank, but it won't hurt anything. I had my ASE Master before I changed careers. I still work on cars if that makes you feel better about it.

Jbulz wrote:

I also had my ASE master before switching to automotive engineering. Catalytic converters are poisoned by oil. I'd rather throw away $10 worth of gas than get hit with a $1-2000 cat efficiency code.

You won't instantly see the effects, but poisoning cumulates over time and will shorten the life of the twc

It won’t hurt a thing.

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7/10/2020 9:11 PM

I was moving across country and had about 5 gallons of premix that I could not take with me and it was leftover from the fall. I put on Facebook market place that it was old premix for free and I had about 4-5 people asking to come to get it And it was gone within 5 minutes.

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7/11/2020 8:52 PM

Goes in the powerwasher. Or into my car. I'm not going to sweat a gallon of stale premix diluted in a full tank. No biggee.

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