Overview

• A UK mechanic named Reaz advised drivers to avoid filling up at Tesco, Asda, Morrisons and Sainsbury's, claiming their fuels often lack detergents that keep fuel systems clean.
• He suggested alternating between premium and standard petrol or diesel as a simple practice to help prolong engine life.
• Motoring specialists at Allied Autocare echoed concerns, saying major brands sometimes add packages that can improve efficiency and cleanliness.
• Industry card provider AllStar rejected damage claims as a myth, noting supermarket and branded tankers often draw from the same refinery tanks, with differences mainly in some premium additives.
• Supermarkets responded that their fuel meets the same standards, with Tesco highlighting its Momentum 99 additive blend and Asda, Morrisons and Sainsbury's stressing quality controls and competitive pricing.