E10 petrol and classic cars: what owners should know
Why most classic and pre-2000 cars should stay on E5, what ethanol does to old fuel systems, and simple steps to protect a classic.
Updated 25 October 2026
The simple rule
Most manufacturers do not approve E10 for cars built before the late 1990s, and many classic makes have no official data at all. For any classic, the safest choice is E5 super unleaded, plus the usual lead-replacement additive if your engine needs one.
What ethanol can do to an older fuel system
- Rubber and cork: older fuel hoses, seals and carburettor parts can swell, harden or crack.
- Metal: ethanol attracts water, which can corrode steel tanks, brass and aluminium parts.
- Fibreglass tanks: some resins can be damaged by ethanol.
- Running: ethanol leans the mixture slightly, which can affect old carburettor settings.
How to protect a classic
- Use E5 super, and check the pump label each time.
- Fit modern ethanol-resistant fuel hose when hoses are replaced.
- Before winter storage, fill the tank with E5 to reduce condensation, and consider a fuel stabiliser.
- Ask your owners' club: many keep make-specific advice.
Why there's often no official answer
Defunct brands (such as Rover or the original MG) cannot publish compatibility data, and the UK government checker notes that many classic and specialist makes have none. When there is no data, treat the car as not approved.
Check your car in 10 seconds
Pick your make and year for the manufacturer's E10 answer.
Frequently asked questions
Is E10 safe for a 1990s car?
It depends on the make. Ford approves E10 from 1992, Toyota from 1998 and Peugeot and Citroën from 2000, for example. Use the checker for your make.
Are ethanol additives worth it?
Additives can help with storage stability and corrosion, but they do not make a non-approved vehicle approved. E5 is the safer choice.
Sources
- GOV.UK – E10 petrol explained (checked 25 October 2026)
- GOV.UK – Check if your vehicle can use E10 petrol (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 in motorcycles, scooters and mopeds
General information only. Always follow your vehicle handbook and the manufacturer's advice.