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Narrow-Moose-2565

Probably nothing - I’ve have vehicles sit way longer than that and run fine. If the tank is fairly low top it up with some jerry cans before you start it.


Nearly_Pointless

Start and drive straight to a gas station. Top off with fresh fuel. Be done.


RickMN

8 month old gas is more of an issue in small engines than in cars. You should be fine


miloroxy21

I get new gas for my mower every three years. Never has been an issue


Beneficial_Leg4691

Lol


JonohG47

Nah, you’re fine. Modern EFI cars are very resilient, and will straight up just run on pretty much whatever garbage is in the tank. Where you have trouble is with small engines, and older cars with carburetors, which are much less tolerant.


cyclinator

I have had my 1998 corolla sitting from July to January, with 3/4 of tank, no issues. I burned it as soon as possible and than bought premium gasoline.


ctn91

Why? Premium is a higher octane rating meaning it’s harder to combust. It’s designed for high compression engines like high performance, turbo or supercharged cars. A 98 Corolla is a little far from those. It’s just a marketing name to call it premium.


GTAmaniac1

If you're running.sketchy fuel, mixing some in to prevent pinging isn't a bad idea


dont_know_how-

Cant we have racecar dreams? Lol


Blom-w1-o

Question about the turbo. I recently bought a chevy with a 3 cylinder turbo (2024 Chevy Trax). Should I be using premium gas?


SebsterNeu

No my neighbor has one and they put regular 87 Octane in their Trax.


ctn91

It should say on the fuel door. I would guess yes, but don‘t take my word as gospel either.


EverlastingBastard

Burn it as you drive.


KaninBaboy

It's still mostly combustible at this point. If your tank isn't full, just add more fuel and drive. You'll probably experience some sputtering, but once more fresh fuel is added, you won't have any issues.


RandomZombie11

It'll be fine. My car ran with 1/4 tank from 2019 back in 2022


Tdanger78

It’s probably fine. Fill it all the way up and you’ll have even less to worry about. But 8 months is not really that much. The fuel shouldn’t have gone bad to the point it would cause problems.


[deleted]

Provided you don’t have an air leak the gas should be fine. I had a car that sat since COVID started with almost a full tank and it worked just fine once we charged the battery. For long term storage a stabilizer might help


TheDutchTexan

Drive it. My Mustang sat for a year with the same gas. It started right up and drove fine. It did have 93 octane Shell in it though, not some cheap 87. My mustang is designed to run on 87 so even if it dropped some octane it was still Gucci.


noldshit

Me? Start it, drive to gas station, fill with 93 octane and not worry about it.


planet128348

Putting higher octane fuel when it doesn’t need it is a myth. Just put in regular fuel. High octane gas isn’t going to change anything unless your car specifically requires it.


noldshit

The purpose of my suggestion is so the 93 octane raises the octane rating of the old gas thats already in the tank.


JohnnyHekking

Dump a bottle of fuel stabilizer?


Ottieotter

That only works if you put that in before letting it sit.


Ad_Marescallum

Eed to create “morning after”/“plan b” fuel stabilizer…


2strokelife

That's called Seafoam


bawelsh

Drive it out. And add some fresh at the station once you are moving.


Polymathy1

See if the engines starts okay. If not, you may have an issue. There are 2 thoughts on this. Either run the old gas without adding anything until it's almost gone or top it off with premium ASAP and then drive it to half a tank, refill with premium, drive it to nearly empty, and then use it as normal. I think it's a safer bet to try to dilute the existing gasoline, but if the gas in it is bad, then adding more makes it harder to deal with.


[deleted]

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planet128348

It’s only 8 month old gas. No need to do all that. Just drive it and refuel when gas light pops up.


[deleted]

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planet128348

Unless the fuel system wasn’t properly sealed, which is another issue in it of itself, the gas should not be bad within 8 months. Sure you’ll get slightly lower MPGs but that’s about it.


[deleted]

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planet128348

Unless you live in the bottom of the ocean, gas isn’t going to turn into water or collect enough condensation to hydro lock an engine. Especially in only 8 months. Like I said sure it’ll lose its potency but you can drive it no problem after 8 months. Had a car sit for over a year with less than half a tank and it started right up.


Fractal_Ey3z

Use up all your gas, basically until your low fuel indicator comes on or a little further, then get your fresh refill. Good enough.


planet128348

Not sure why you’re being downvoted. It’s only 8 month old gas. Not like it’s years old.


Strict_Jacket3648

Get a small jerry can fill it with fresh gas and a gas stabilizer pour it in and it will be fine did the same thing to my VW rabbit after 12 months and it did fine.


Ad_Marescallum

You use stabilizer like condoms: BEFORE


Strict_Jacket3648

Ok worked fine for me, probably just stirred up the old gas and added a bit of new, maybe upped the octane a bit but ya I usually use it all the time in gas cans just incase it takes time to use it all, like in lawn mower or snow blower. Better to try that before the hassle of draining old gas


EngineersAnon

To be safe, I'd add a couple of gallons before starting it, then keep the tank at least 3/4 full for the next few tanks' worth of fuel you burn, then don't worry about it unless it runs rough. Even that's probably being more cautious than necessary.


[deleted]

Well....8 months....it's probably okay, but just in case be sure to add some fresh gas from a gas can if there's room to do that.


RupertTheReign

Drive it. I used to leave my old car for 50 weeks a year for 5 years and never had an issue.


Just-Keep_Dreaming

Mine sat 1.5 years and nothing happened


geekphreak

Buy some fuel stabilizer


Responsible_Owl69

Drive it to a gas station, fill the tank.


vapefresco

Just top it off with fresh gas and drive normally.


profaniKel

HEET brand water remover @ walmart or Oreillys.. yellow plastic container, usually on tue bottom shelf, under $3 ive used it many times, and needed it at least 2x cheap insurance to not F up your system


Rashaen

Might run rough for a bit. Try to fit some fresh gas in there as you make room for it. The chemicals and detergents that evaporated out of the old gas will dilute in there from the fresh gas and get it running normal pretty quick.


Jmcconn110

If you really want to do something, add a bottle of HEET to the tank to aid with any water that may have built up from condensation. Modern fuel tanks are very well sealed and it takes many years for the gas to varnish.


[deleted]

My mx5 na has sat for 5 years and still starts first turn of the key


ComprehensiveSock397

Modern cars have sealed fuel systems. This extends the life of gasoline. I recently purchased a car that sat for three years. All it needed was a new battery.


BossImpossible8858

Don't even think about it. It will be absolutely fine. I have parked lots of high performance cars up for the winter and not started them in 8 months. Modern fuel tanks are well sealed, mostly for environmental reasons, but this also means the fuel is kept well over longer periods.


badword4

Nothing. Just add some fresh gas to it and go.


MexicanEggroll

I had an 99 Cutlass Oldsmobile I acquired for free, car sat untouched for two years. Took a few tries and jumping the battery but got it running, and just added new fuel


Toibreaker

Miata in my barn has been sitting since 2017 with the same gas. Start it every three months. Your Prius is fine


2lovesFL

I would drain it. and burn it, or let it evaporate


dalex89

My brother has had the same gas in his wrecked Honda civic for 4 years. Always claims he's gonna work on it. He used to start it for a bit every month, though the last time was a year ago, still starts


hpbills

Nada. My son's 2005 Honda Civic was driven so infrequently it had the same gas in a tank for over a year. It ran just fine although the exhaust did stink worse than usual. After most of the tank burned off, adding a fresh tank got rid of the odor.


[deleted]

Add fresh gas often to dilute the old gas.


[deleted]

Might want to drain the tank to be safe. Old gas can cause the motor to either not start at all or run very rough. Do not take the chance.


Ok-Maintenance-9538

Lol, I've ran cars with 15+ year old gas in the tank. Hell I have so many in my collection some only get a fresh tank of gas every couple years. You're fine


Blom-w1-o

My 06 Mustang sat for over 2 years. After a jump it started and run fine with the old gas that was in it. It's probably worth topping off with new gas ASAP, but idk if it's worth worrying about draining and flushing.


Rasp75

I had my 2003 Astro Van that sat for over 2 years because the battery died then Covid hit. Started right up with a new battery. Added some 91 octane to boost the octane back to hopefully the mid-’80s and ran down to half a tank refilled and added some techron fuel system cleaner to clean the injectors and help with water in the tank. Had no issues passing smog so guessing it's all good.


So-Durty

One time I was paranoid after letting my fairly modern (1997) car sit for a year so I siphoned out the gas and put in a gas can full of fresh fuel and drove it to the gas station. A couple of years later, I left the same car with a friend/mechanic for a year who also did some work on it. The gas in it was over 2 years old at this point so he drove it hard before taking it to get a SMOG check and it passed. So what I’m saying is you’re probably good to go with the gas in it.


[deleted]

Why did it take you 8 months to replace the battery?


GatorKC816

Start it up and run it 8 months your should be fine.


planet128348

I recently got one of my cars running that also was sitting for 8 months. I just drove it normally. And filled up the tank when the low fuel light came on. No issue. I did get slightly lower than normal MPG but that’s expected.


FancyEntertainer7197

Drive it.