It’s been about three-and-a-half weeks now since I filled up a couple 5-gallon containers in anticipation of power outages during a winter storm. Since I’m a dumb dumb, I did not add stabilizer at the time, but I do have some Seafoam stabilizer on hand.
I understand fuel degrades over time and running degraded fuel can damage engine parts. Should I pour the fuel into my vehicle or will that gum up my car’s engine? Is it still worth adding stabilizer today so that I can continue to store it in my garage for a rainy day? The only other responsible alternative I can think of is taking it to a hazardous disposal site in my county. It’s octane rating 87, I believe it also has ethanol, in case that makes any difference.
ChrisFix said once (in the first Mustang video at 7:40) that you try old gasoline in your lawnmower. If the lawnmower works, you can probably use it in a car.
I just ran my snow blower on fuel bought in October… If I don’t use it all, it goes in the truck in March/April. It may have done 89 this season… But I’ve never had issues with 87. Except for 2cycles… Buy the canned/ethanol-free stuff or switch to electric.
3 weeks is fine. Add stabilizer now. It will be fine in a vehicle.
Three-week-old fuel is brand new. I don’t even fill up my car that often.
No issue here.
I’m guessing those tanks have been sealed from when you filled them?
Gas goes bad primarily from absorbing water from the air, oxidation, and evaporation. Since the tanks were kept closed, the gas will last for years.
Gas cans that are used frequently need stabilizer because every time you pour a little to fill a lawnmower, fresh air gets in to replace the volume poured out.
Correct, they’ve been sealed since I filled them three weeks ago. Thanks for explaining a little more around how gas degrades.
If you are concerned about it, you can mix 5 gallons at a time in your car with the remainder being fresh gas. I.e. if you have a 15 gallon tank, use 10 gallons of new gas with 5 of old.
3 weeks isn’t all that long though, its probably fine as long as you didn’t leave the cap off.
What kind of car is it potentially going in?
Thanks for weighing in. It would be going into a Mazda 3 or a Honda CRV.
If they are non turbo, it should be fine. If they are turbo cars, run premium for the new fuel and use a minimum 3 to 1 ratio of new to old fuel just to be safe.
Really, 3 weeks is fine but I don’t want to lead you astray and cause problems here lol. I’d run it though.
Nah you’re good
Should be fine on more modern cars (ie. Everything with fuel injection, newer than 1990)
I run gas that’s probably 1-2y old in my pickup and never had any issues.
Just beware that ethanol might hurt rubber lines if you have them. So best to mix it with some new gas over time
