E10 in lawnmowers, chainsaws, outboards and other small engines
Can you use E10 in a lawnmower, strimmer, generator or boat engine? Practical advice on fuel choice and storage for small engines.
Updated 25 October 2026
Garden machinery
Most modern four-stroke mowers and garden machines will run on E10, but they sit unused for months, which is where ethanol causes trouble: water absorption, phase separation and gummed-up carburettors. Check the engine handbook (many say "up to 10% ethanol").
- Buy small amounts of fuel and use it within about a month or two.
- For seasonal storage, use E5 or a ready-mixed alkylate fuel, or run the engine dry.
- For two-stroke tools, mix oil with fresh fuel only.
Boats and outboards
Marine engines are especially exposed to moisture, and some older boats have fibreglass fuel tanks that ethanol can damage. Check your engine maker's guidance and use E5 if in doubt. In the USA, using E15 in boats and any off-road engine is prohibited.
USA: small engines and E15
US federal rules do not allow E15 in lawn and garden equipment, boats, motorcycles, snowmobiles or other off-road engines. Look for the orange E15 pump label and use E10 or ethanol-free gasoline for these engines.
Check your car in 10 seconds
Pick your make and year for the manufacturer's E10 answer.
Frequently asked questions
Can I put E10 in my lawnmower?
Usually yes if the handbook allows up to 10% ethanol, but use fresh fuel and don't leave E10 in the tank over winter.
What fuel is best for storing small engines?
Ethanol-free or alkylate fuel keeps best. E5 is a good second choice.
Sources
- GOV.UK – E10 petrol explained (checked 25 October 2026)
- U.S. Department of Energy (AFDC) – E15 (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.