An investigation is continuing today into reports that at least 70 motorists have experienced problems with their cars because of alleged petrol 'contamination'.
The Trading Standards Institute (TSI) said trading standards authorities in the south-east of England had received up to 100 reports from motorists complaining that their cars were not running properly.
Media reports cite the inclusion of ethanol in petrol as causing problems with vehicles which have not functioned properly.
It will take until the end of the week for fuel samples taken yesterday by the TSI to establish whether any contamination has taken place.
Both samples of fuel from affected cars and those from pumps where the petrol was drawn from are under investigation.
Ian Hillier, TSI lead petroleum officer, said: "We can say… that the problem appears to be restricted to unleaded petrol and that motorists experiencing problems with their cars should take them to a garage.
"We would also advise them to keep their petrol receipts and ask the garage to take a sample of the fuel should they need to make a claim at a later date."
Supermarkets Tesco and Morrisons said their own initial tests did not reveal any irregularities.
"Having received a limited number of enquiries further tests were carried out. These found no contamination and confirmed our unleaded petrol met the required standards," a Morrisons spokesperson said.
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