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They urge drivers to top up their tank with E5 as soon as possible, ideally before at least a third of the tank has been used.
RAC fuel spokesman Simon Williams said it was “vital” owners of older models were “aware of the changes”.
He has called for the DVLA to inform owners personally of the change and how they can ensure their cars are protected.
He said: It is also vital that owners of affected vehicles are aware of the changes.
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“We’d like to see the DVLA writing to these owners to inform them that E5 will no longer be the standard premium grade, and to let them know their options.”
“These models can only use regular unleaded or premium unleaded petrol.
The European Automobile Manufacturers Association (ACEA) has confirmed all petrol BMW models are cleared to use E10 regardless of their year of manufacture.
However, the minimum octane required should still meet the guidelines set out in the owner’s manual.
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E10 fuel is cleared for all Fiat models with petrol engines of Euro 3 mission levels or newer starting from models built after the year 2000.
Last year, a DfT consultation revealed the Government was working towards a 2021 implementation date for the new fuel.
However, no date has yet been officially agreed, hinting the changes could be scheduled for the autumn.