98 fuel expiry in take

[T3rminator]

How long will 98 fuel quality stay good in a car's tank?


With the lock down currently in place, a full tank might take 1 to 2 months to cycle through. Is that ok? Or should we avoid filling up full tank in any one time? Car is tuned to 98.

[Burnout]

Seems it will last about 3months or more.

[Tassie f100]

Better to have a full tank rather than 1/4 or 1/2 if you want it to stay fairly fresh for a few months.Don’t know about 98 but I had the old lawn mower with about 1/2 tank(probably a litre) still smelt alright and started with 2 pulls and ran good after sitting unused for at least 6 months

[oldel]

My BA had 2-3 years between starts and ran fine on 91 but I don't recommend that.
3 months is a cake walk - people do that all the time (those that have long work or holiday periods or those with car collections). 6 months is considered pushing it by people that have had problems (mainly countries that freeze in winter), and a 98 tune would have that as a max limit. E: 98 is more stable than lower grades, so I've heard 9 months for degradation on that, so 6 months is considered safe.

[Itsme]

Add some fuel stabiliser.

[Yellow_Festiva]

I have an old car that hardly gets driven. Has sat for several years.

Here is what I did. kept the tank half full, filled a 5L jerry can with 98 and tipped it in before starting.

Started, babied it to a servo filled tank with more 98. Filled tyres to pressure.

Drive it around to flush out the cobwebs and to attend to servicing needs.

Parked and repeated every year.

In the first few years I used to add an octane booster to the 5L jerry can but I doubt it made much difference.

[oldel]

I'd say keep it full. The biggest risk in fuel aging is oxidation and evaporation. The more fuel in the tank, the less air. And these days tanks are usually sealed up with canisters and purge valves plumbed to the intake rather than venting out.

The biggest problem with old fuel/storage has always been open pressure vents, carbies with open float bowls etc. A full tank in a modern sealed vent system has way less chance of going bad due to oxidation and evaporation.

[383hq]

I use to be in the "keep the tank" full camp.

but it makes more sense to me now to keep 1/4 tank, and then fill with fresh fuel when I need it.

I have no idea how long the megalitres of 98 are stored in refineries, ships, trucks, or fuel station tanks, before i get it.

I did ask once at the servo, but they suddenly got very defensive, asking if I've damaged an engine, without answering the question of litres/ time between refills at the local servo. It was almost as if legal training had been provided...

[jmack]

Went to start mine the other day only use bp95 or 98 and its stuffed the pump and turned to solvent.new pump on order and giving the sta bil stuff ago as the is the 3rd pump now

[oldel]

Wow, unlucky. As I mentioned on 91 I had my ute parked from ~2012-2015, then again from 2015-2017. I've also run out of fuel twice but my pump seems a little trooper. I'm suprised mine hasn't failed.