Is It a Big Problem to Fill Up with Low-Quality Fuel Once?
3 Answers
In daily driving, if you accidentally fill up with low-quality gasoline once and no warning light appears on the vehicle, it indicates that the car is fine. However, if the vehicle displays a warning light, do not start the engine again and promptly contact a repair shop for maintenance. The hazards of low-quality fuel are as follows: Clogging the fuel system: Low-quality fuel contains more impurities, which can lead to incomplete combustion, producing numerous fuel residues that obstruct the fuel supply, causing severe vehicle shaking during driving. Engine carbon buildup: The incomplete combustion of gasoline generates carbon deposits that adhere to the engine's surface, soon leading to increased fuel consumption and, over time, potential engine damage. Damage to the catalytic converter and oxygen sensor: Substandard fuel quality results in poor exhaust emissions after combustion. The catalytic converter purifies exhaust gases for emission, but if the exhaust contains excessive impurities, they can adhere to the catalytic converter, causing its damage.
I've encountered this issue before. During a long-distance trip, I tried to save money by filling up at a small gas station with low-quality fuel. After just a few dozen kilometers, my car started jerking, accelerating sluggishly, and the fuel consumption skyrocketed. I immediately drove to the 4S dealership for inspection. The technician used a diagnostic tool and found that the fuel contained too many impurities, clogging the fuel injectors and spark plugs, leading to incomplete combustion and excessive carbon buildup. While one fill-up won't immediately damage the engine, neglecting it can cause long-term wear on components. I spent some money to clean the carbon deposits and change the oil, which improved the situation significantly. Since then, I only refuel at reputable, large-brand stations with properly graded fuel—it's worry-free and safer. Before filling up, I also make it a habit to check the station's ratings or reviews on apps.
After years in the auto repair business, I've seen too many car owners suffer from using low-quality fuel. One-time use may not cause significant damage, but it depends on the situation. Extremely poor fuel can directly clog the fuel filter or injectors, especially in modern vehicles with sensitive electronic systems that are prone to triggering fault codes. The solution is simple: after filling up with bad fuel, add a bottle of reliable fuel cleaner, such as burning through that tank during highway driving, then refill with good-quality fuel. If the car shakes or lacks power, it's advisable to have the spark plugs and oxygen sensors checked at a repair shop. When choosing gas stations, don't just go for the cheapest option—opt for reputable brands like Sinopec or Shell. Regular maintenance also helps prevent problems before they occur.