E10 vs E5 petrol: which should I use?
Side-by-side comparison of E10 and E5 petrol: ethanol content, octane, price, economy and which cars need which.
Updated 25 October 2026
At a glance
| E10 | E5 | |
|---|---|---|
| Ethanol content | Up to 10% | Up to 5% |
| Usual UK grade | Standard unleaded (95 RON) | Super / premium (97–99 RON) |
| Price | Cheapest petrol | Usually several pence per litre more |
| Who should use it | Approved vehicles (most built since about 2000; all new since 2011) | Non-approved, classic and some older vehicles; anyone unsure |
| Storage | Absorbs more water; use within a few months | Keeps slightly better in stored vehicles |
How to choose
- Look inside the fuel filler flap. An "E10" label means you can use it.
- Check the handbook for "E10" or "EN 228".
- Use the E10 checker for your manufacturer's official statement and exceptions.
- Still unsure? Use E5. Any petrol vehicle that runs on unleaded can safely use E5.
Is E5 "better" for an approved car?
Not for an everyday car that is approved for E10. You pay more for E5 super mainly because of its higher octane. Some high-performance engines are tuned for 97–98 octane and may run slightly better on super; your handbook says if that applies.
Same labels across Europe
The E5 and E10 circle labels are the same across the EU and UK (standard EN 16942). In Germany look for "Super E10", in France "SP95-E10" (E10) versus "SP95" or "SP98" (E5).
Check your car in 10 seconds
Pick your make and year for the manufacturer's E10 answer.
Frequently asked questions
Will E5 be withdrawn in the UK?
The UK kept E5 available as a "protection grade" when E10 launched in 2021. Check GOV.UK for the latest position before assuming it will stay.
Can I use E5 in an E10 car?
Yes. Any car approved for E10 can use E5.
Is super unleaded always E5?
In the UK, the super grade is generally E5, but always check the label on the pump.
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
- Put E10 in a car that isn't approved? What to do
- E10 petrol and classic cars: what owners should know
- E10 petrol in motorcycles, scooters and mopeds
General information only. Always follow your vehicle handbook and the manufacturer's advice.