A top car mechanic has issued a warning to petrol and diesel drivers about filling up at supermarket petrol stations. Reaz, who has 17 years of professional experience and runs his own garage, suggests motorists should avoid stations run by major retailers such as Tesco , Asda , Morrisons and Sainsbury's .

In a conversation with GSF Car Parts, he pointed out that supermarket fuels often lack the "necessary detergents" required for maintaining a clean fuel system. He also recommended that drivers alternate between premium and standard fuel when visiting petrol stations.

He warned that alternating between different types of fuel is a "simple practice that can extend the life of your vehicle's engine."

Specialists at Allied Autocare have similarly warned that supermarket fuel may b

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