How long does E10 petrol last? Storage tips
How long E10 keeps in a car, can or tank, why ethanol fuel absorbs water, and how to store vehicles and fuel safely.
Updated 25 October 2026
How long does it keep?
All petrol slowly loses its more volatile parts. Ethanol-blended fuel also absorbs moisture from the air. As a rule of thumb, aim to use E10 within about three months in a can or a vehicle that isn't being used; in a sealed car tank in regular use, freshness is not an issue.
Phase separation explained
If enough water gets into ethanol-blended fuel, the ethanol and water separate out and sink to the bottom of the tank. Engines can then draw in a water-rich layer that runs badly and can cause corrosion. Keeping tanks full and containers sealed reduces the risk.
Storage tips
- Store fuel only in approved containers, in a cool, ventilated place, and follow local limits on how much you may keep at home.
- For vehicles laid up over winter, fill up (with E5 if you can) to limit air and condensation.
- A fuel stabiliser can help, but does not reverse water contamination.
Check your car in 10 seconds
Pick your make and year for the manufacturer's E10 answer.
Frequently asked questions
Does E10 go off faster than E5?
It is more prone to absorbing water, so for long storage E5 or ethanol-free fuel is better.
How much petrol can I store at home in the UK?
Limits apply (for example, up to 30 litres at a home without a petroleum storage certificate). Check the latest UK HSE guidance.
Sources
- GOV.UK – E10 petrol explained (checked 25 October 2026)
- HSE – Storing petrol at home (checked 25 October 2026)
Related guides
- What is E10 petrol? A plain-English guide
- E10 vs E5 petrol: which should I use?
- Put E10 in a car that isn't approved? What to do
- E10 petrol and classic cars: what owners should know
General information only. Always follow your vehicle handbook and the manufacturer's advice.