Overview

• Mechanic Reaz urged motorists to avoid Tesco, Asda, Morrisons and Sainsbury’s forecourts, claiming supermarket fuels lack necessary detergents, and he advised alternating premium with standard fills to help engine longevity.
• Motoring specialists at Allied Autocare echoed concerns, suggesting supermarket petrol may be lower quality than branded fuels that use proprietary additive packages.
• Fuel card firm AllStar dismissed damage fears as a myth, noting supermarket and branded tankers often load from the same tanks, with differences largely tied to premium additive blends.
• Tesco highlighted its Momentum 99 petrol as an additive‑containing, higher‑octane option, while Asda said its fuel meets the same standards and comes from the same refineries as oil‑major stations.
• Morrisons and Sainsbury’s emphasized locally competitive pricing, and the reports cited no independent laboratory testing or regulatory findings to verify either side’s claims.