Never Buy Gas From These 9 Stations Mechanics Say They’re Destroying Your Engine

Not all gasoline brands protect your engine, and choosing the wrong station can trigger engine knock , carbon buildup engine damage and a flashing check engine light . Mechanics warn that low 61 fuel quality and non top tier gas cause expensive car maintenance bills. In this video from Car Failure Files, we expose 9 stations to avoid and reveal the best gas for car engine longevity, including Top Tier certified options that prevent carbon deposits. A 2023 to 2025 New York City inspection found 96 percent of 729 stations failed quality standards for octane fraud, water contamination and low detergents. That means premium labeled 91 or 93 octane pumping as regular, phase separation from ethanol and water, and MMT additives that clog direct injection engines. In this video we break down: Safeway grocery fuel, Sam's Club, 7-Eleven, Speedway, Circle K, Murphy USA, Love's Travel Stops, Pilot Flying J, and unbranded no-name independents, plus 7 safer picks: Sunoco, Valero, QuikTrip, Exxon and Mobil, Shell, Chevron and Texaco, and Costco Top Tier gas. Learn bad fuel symptoms, how to check Top Tier certification, and simple 71 car care habits to protect fuel injectors, spark plugs and catalytic converters and save thousands in repairs. Subscribe to Car Failure Files for honest mechanic tested 71 car maintenance tips, teardowns and buyer protection guides that keep older cars running longer. 00:00 Never Buy Gas From These 9 Stations 01:35 #9 Safeway Grocery Fuel - Loss Leader Problem 02:47 #8 Sam's Club - Not All Warehouse Gas Is Equal 03:38 #7 7-Eleven - Inconsistent Supplier Problem 04:44 #6 Speedway - Same Uncertified Fuel 05:51 #5 Circle K - Fuel Trim Issues 07:06 #4 Murphy USA - Price Over Protection 08:44 #3 Love's Travel Stops - Phase Separation Risk 09:59 #2 Pilot Flying J - Water Contamination Risk 11:28 #1 Unbranded No-Name Stations - Worst Offender 12:35 7 Safe Stations That Protect Your Engine 12:52 #7 Sunoco - Certified and Misunderstood 13:20 #6 Valero - Best Value Certified Gas 13:53 #5 QuikTrip - Volume and Freshness 14:19 #4 Exxon and Mobil - Widespread Coverage 14:42 #3 Shell - Proprietary Additives 15:23 #2 Chevron with Techron 16:06 #1 Costco - Top Tier Plus and Best Value 17:00 The 4-Second Check Before You Pump never buy gas from these 9 stations mechanics say they’re destroying your engine,never buy gas from these 9 stations — mechanics say they’re destroying your engine,never buy gas from these 9 stations — mechanics warn they could destroy your engine,never buy gas from these 9 stations — mechanics say they're destroying your engine