Almost one million drivers will have to cough up for more eco-friendly petrol or risk engine damage.
At the moment, motorists and motorbikers' normal petrol is called E5.
It has five per cent bioethanol which is better for the environment than 100 per cent petrol, the Mirror reports.
From September E5 will change to E10 which has 10 per cent bioethanol.
The switch aims to slow down climate change as less CO2 emissions will be released.
All cars and motorbikes built since 2011 can take E10.
The same can be said for most motors built in the late 1990s.
But around 5 per cent of vehicles cannot take the new petrol, according to the Government.
There are around 32.7 million cars in the country, and 18.7 million run on petrol, according to the RAC.
That means 935,000 can't run on the new E10 fuel without issues.
There are also approximately 1.27 million motorbikes, almost all of which run on petrol, meaning 63,500 are also affected by the change.
How to check if your vehicle needs E5
A government website lets you check if your vehicle can run on E10 .
You will need to know the vehicle model, engine size and year it was manufactured.
However, it warns: "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."
For example, all Ford cars sold in Europe since 1992 are fine with E10, bar the Ford Mondeo 1.8 SCI from 2003 to 2007.
Pre-January 2000 Citroens and Nissans cannot use E10 regularly.
All Renaults sold since January 1 1997 can use E10, except certain models.
These include the Megane 1 with 2.0 litre F5R direct injection petrol engine, sold between 1999 and 2003.
All Harley-Davidsons sold since 1980 can use the new fuel with no problems.
If your vehicle won't run on E10, don't worry. E5 will still be sold at most petrol stations with at least two sorts of the fuel - which is most of them.
But E5 will become 'super' grade fuel, rather than the current 'premium' grade - meaning it will cost more than E10.
You can also occasionally put E10 in a car meant for E5, but not regularly, as this risks damaging the engine.
E10 is also slightly less efficient than E5. The government said you may see a 1% fall in the amount of miles you get per gallon of fuel.
The cost of motor fuel rose 0.72 percentage points in May - the biggest factor behind inflation rising overall.
The Office for National Statistics said average petrol prices were 127.2p per litre in May 2021, compared with 106.2p per litre a year earlier.
Get the latest money-saving and benefits news sent straight to your inbox. Sign up to our weekly Money newsletter here .
