A new E10 petrol is due to be launched next month.
Normal petrol is currently E5, meaning it has 5% bioethanol and is better for the environment than using 100% petrol.
The government is rolling out the new petrol so vehicles will put out less C02 which will slow down climate change.
But despite the new fuel being better for the environment, almost one million cars and motorbikes might not be compatible for it.
All vehicles built since 2011 are compatible with E10, as are most from the late 1990s, but the government has warned 5% won't be.
According to the RAC, there are around 32.7million cars in the country, and around 18.7million use petrol.
However if your vehicle isn't compatible, your car insurance won't cover you for putting the wrong fuel.
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It is thought around 935,000 vehicles can't run on the new E10 fuel without possible issues.
There are almost 1.27million motorbikes, almost of which run on petrol, meaning 63,500 will be affected by the change.
You can occasionally put E10 in a vehicle meant for E5, but not regularly as this could damage the engine.
And if you do use the wrong engine, 46% of car insurance policies won't pay out for any repair costs, according to Which?.
Fortunately you can check if your vehicle can run on E10 by heading to the government website.
You will need to know the vehicle model, engine size and year it was manufactured.
It warned: "DfT and its partners will not be liable for any damage to your vehicle as a result of you using this service.
"It's your responsibility to make sure you use the right fuel for your vehicle."
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