Person putting petrol into a red car.

What is E10 petrol?

UK fuel stations have started selling E10 petrol. Here’s everything you need to know.

Cazoo Editorial Team Byline Icon

By Cazoo editorial team

From September 2021, fuel stations across the UK started selling a new type of petrol called E10. It replaces E5 petrol and will become the ‘standard’ petrol at all fuel stations. Why the change and what does it mean for your car? Here’s our handy guide to E10 petrol.

What is E10 petrol?

Petrol is mostly made from oil but there’s a percentage of ethanol (pure alcohol, essentially) in it, too. The regular 95 octane petrol that currently comes out of the green pump at a fuel station is known as E5. That means 5% of it is ethanol. The new E10 petrol will be 10% ethanol. 

Why is E10 petrol being introduced?

The growing climate change crisis is leading governments around the world to use as many means as possible to reduce carbon dioxide emissions. E10 petrol helps achieve that goal because cars produce less CO2 when they burn ethanol in their engines. According to the UK government, switching to E10 could reduce total CO2 emissions from cars by up to 2%. Not a huge difference, but every little helps.

What is E10 fuel made from?

Petrol is a fossil fuel mostly made from crude oil, but the ethanol element is made from plants. Most of the companies that make fuel use ethanol that’s produced as a byproduct of sugar fermentation, primarily in breweries. That means it’s renewable and therefore much more sustainable than oil, reducing CO2 emissions in production as well as in use.

Can my car use E10 fuel?

Most petrol-powered cars in the UK can use E10 fuel, including all petrol cars sold new since 2011 and many made between 2000 and 2010. Even at the 10% formula, the UK actually uses quite a low percentage of ethanol compared to some other countries that have used much more for many years. There are even some countries where cars use pure ethanol. Most cars available in the UK are sold all over the world, so they’re designed to use petrol with a greater ethanol content.

How can I find out if my car can use E10 fuel?

Most cars made since 2000 can use E10 fuel, but that’s only a rough guide. You need to know for sure whether your car can use it. Doing so could damage your car’s engine – see ‘What can happen if I use E10 fuel by mistake?’ below.

Fortunately, the UK government has a website here where you can select the make of your car to check whether it can use E10 fuel. In many cases, the vast majority of models can use E10, but any exceptions are clearly listed.

What should I do if my car can’t use E10 fuel?

It’s only regular, 95 octane petrol from the green pump that will now be E10. High-octane premium petrol like Shell V-Power and BP Ultimate will continue to be E5, so if your car can’t use E10 you can still top up using this. Unfortunately, it will cost you around 10p per litre more than regular petrol, but your car’s engine should run better and might even give you better fuel economy. Premium petrol is usually dispensed from a green pump that’s branded with either the fuel’s name or the octane rating of 97 or higher.

What can happen if I use E10 petrol by mistake?

Using E10 petrol in a car that’s not designed for it won’t cause any issues if you fill up with it once or twice. If you do so by accident you won’t need to get the fuel tank flushed out but it’s a good idea to add some E5 petrol as soon as you can to dilute it. It’s fine to mix the two. 

If you use E10 repeatedly, however, it can start to erode some of the engine components and cause long-term (and potentially very costly) damage.

Will E10 petrol affect my car’s fuel economy?

Fuel economy can be slightly worse when the ethanol content in petrol increases. However, the difference between E5 and E10 petrol will likely only amount to a fraction of a mile per gallon. Unless you cover very high mileage, you’re unlikely to notice any reduction.

What does E10 petrol cost?

Theoretically, the lower oil content means E10 petrol costs less to produce and should cost less to buy. But if the price of petrol does go down as a result of the switch, it’ll only be by a very small amount that won’t make much difference to the price of a refill.

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