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Hi people,

I have to admit i didn't use the SEARCH function on this question, a little lazy.

I am wondering if the petrol you pump into your vehicle will stay 'fresh' after 2 weeks inside your car?

I remember i read from somewhere on the forums where people did mention that the 98RON might lose a few 'RONs' or something like that.

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2 weeks LOL... nothing will happen.. Well nothing to be concerned about... My fuel opften takes 1 month or so to get used... Still drives fine.. I'd only be concerned if your running high end power.. My fuel was sitting there for just over 8 months.. and finally drove the car the other day.. Mind you i am staying off boost until a fresh tank can be run though..

Edited by .:: GimpS-R34 ::.
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fuel doesn't go stale in 2 weeks. it does go stale over time, but not in 2 weeks, or even a month really. that said a car will still run on fuel that is pretty old, just not that well. i've got an old commodore and the fuel in it is a mix of about 6 months old and 2 years old and it still starts and runs. my mother has a 2000 model corolla and she had to have an operation and couldn't drive for about 3 months and her car ran fine after those 3 months (i drove it occasionally during those 3 months, but never put fuel in it)

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the amount that it gets diluted it's not worth thinking about though.

but in case you wanted to think about it.....

fill 1: 50L of fuel put in. for arguments sake we'll say it's a 50L of fuel and was drained prior to filling

fill 2: filled up with 10L left, so there's 40L fresh fuel and 10L 1 week old fuel

fill 3: filled up with 10L left, so now there's 40L fresh, 2L from fill 1 and 8L from fill 2

fill 4: filled up with 10L left, so now there's 40L fresh, 400ml from fill 1, 1.6L from fill 2 and 8L from fill 3

fill 5: same as above but now the 10L consists of 80ml of fill 1, 320ml from fill 2, 1.6L of fill 3 and 8L of fill 4.

so when you look at it like that, 40L is from the current fill, 8L is only 1 fill old and the remaining 2L is 2 fills or older and the stale fuel from fill 1 is going to be negligable (only 400mls of fuel in the tank is from 3 or more fills ago). the amount of fuel that is multiple fills old is always going to be small even if you will up with more than 10L to go.

but theoretically speaking the fuel tank still contains an extremely tiny amount of fuel from the very first time it was filled up.

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I dont think fuel goes of that quickly, it would take a few months atleast. It might depend on weather to? I think in the summer it may go off quicker but still not in a time span you would have to worry about unless you wern't going to drive your car for like 6 months. Even then it should be fine.

I have driven cars straight of the boat from japan and they drive fine and god knows how old the fuel is by time the car reaches Aus.

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Fuel does go stale over time. But months or years, not weeks, something like methanol you'd need to be more careful about but not boring unleaded. Lol. Get cars at work driven in by the "seniors", they keep the tanks filled to the neck and re-filled weekly after their one trip to the shops, fuel comes out yellow and has no smell to it, car runs, but poorly, but this is after 5+ years. And usually it's the water in the fuel causing problems in these cases...

Also, my car was knocking under load (so I stopped loading it) on it's journey home post-purchase (import from a dealer), good tank of 98' and it went away...

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fuel doesn't go stale in 2 weeks. it does go stale over time, but not in 2 weeks, or even a month really. that said a car will still run on fuel that is pretty old, just not that well. i've got an old commodore and the fuel in it is a mix of about 6 months old and 2 years old and it still starts and runs. my mother has a 2000 model corolla and she had to have an operation and couldn't drive for about 3 months and her car ran fine after those 3 months (i drove it occasionally during those 3 months, but never put fuel in it)

Thanks for sharing.

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Edited by nicoledc109
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