Motorists have been warned to double check whether their vehicle is compatible with a new type of fuel set to be rolled out next month.
E10 petrol is already used in several forecourts across the country but could be at risk of damaging some made before 2011.
A government scheme allows drivers to double check whether they have one of the million UK-registered vehicles set to be affected.
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However, according to the RAC, there will be makes of cars that will not be compatible with the E10 petrol and users should be made aware of them
These are the 10 models that will have the most registered E10-incompatible cars in 2020, according to the RAC Foundation (number of cars in brackets):
1. Volkswagen Golf (28,066)
2. MG MGB (20,890)
3. Mazda MX-5 (18,162)
4. Nissan Micra (15,785)
5. Morris Minor (12,796)
6. Rover 25 (9,879)
7. MG MGF (9,352)
8. Ford Escort (8,947)
9. Rover Mini (7,614)
10. MG TF (7,568)
Malcolm McKay, spokesperson for the Historic and Classic Vehicle Association, warned it was not all bad news.
He told Birmingham Live E5 fuel would likely be available “for a while” due to the popularity for higher octane fuels.
He said: "It certainly hasn’t had as much publicity as the change from leaded to unleaded fuel.
"It's another of those things, I think that the classic car movement to an extent have been scared to make too much of a fuss.
"We’ve just got to find a way around it.
"E5 is still going to be available for a while but it's more a case of the Government has said it can be available.
"It’s then up to the oil companies and the suppliers to decide whether there is enough demand.
"But as it’s the higher octane fuel and there's quite a lot of younger cars that run a lot better and more efficiently on the higher octane fuel I think we will see it around for quite a long time.
