What Happens If You Add Low-Quality Gasoline?

[McAndrew]

Cars filled with low-quality gasoline may exhibit the following symptoms: difficulty starting or even failure to start; engine shaking at idle after starting; noticeable body vibration; foul-smelling exhaust gases; noisy valves; poor acceleration and high fuel consumption; gear shifting with impact. The vehicle maintenance plan after adding low-quality gasoline is as follows: 1. If the vehicle can currently drive normally without symptoms, completely drain the remaining fuel in the tank, refill with high-quality gasoline, clean the fuel injectors, clean the combustion chamber, and replace the fuel filter. 2. If the vehicle drives normally but the engine shakes slightly at idle, completely drain the remaining fuel in the tank, refill with high-quality gasoline, clean the throttle body, clean the fuel injectors, clean the combustion chamber, and replace the fuel filter and fuel pump. 3. For vehicles that are difficult to start, fail to start, have engine shaking, poor acceleration, gear shifting impact, or noisy valves, stop driving immediately and request assistance from a 4S shop. Measure cylinder pressure; if the cylinder pressure is normal, disassemble the cylinder head for cleaning, completely drain the remaining fuel in the tank, refill with high-quality gasoline, clean the throttle body, clean the fuel injectors, clean the combustion chamber, and replace the fuel filter and fuel pump.

[LaGabriela]

Last time I accidentally filled up with substandard gasoline, and my car immediately had issues. The engine shook like a sieve, felt powerless even when flooring the accelerator uphill, and fuel consumption suddenly surged by 15%. Later at the repair shop, I learned that the impurities and moisture had completely clogged the fuel injectors, and the spark plugs were coated with thick carbon deposits. The most troublesome part was the gummy sediment in the fuel tank, which cost over 800 yuan to clean. This type of fuel burns incompletely and can cause black smoke from the exhaust pipe, definitely harming the engine in the long run. Now I only refuel at reliable major stations like PetroChina, since repair costs are much higher than the little savings from cheaper fuel.

[LaTeagan]

Using low-quality gasoline is like feeding your beloved car with gutter oil. In the short term, you might only experience acceleration stutters or an illuminated engine warning light. But gradually, you'll notice difficulties with cold starts and pungent exhaust fumes. This is due to the excessively high sulfur content in the fuel, which corrodes the oxygen sensor and catalytic converter. Last time, a friend of mine tried to save money by filling up at a shady gas station, and ended up replacing the entire fuel system after just 20,000 kilometers, costing thousands. Remember, if you feel anything unusual right after refueling, don't hesitate—drain the tank immediately. Otherwise, gum deposits will become increasingly difficult to clean. It's advisable to regularly use fuel system cleaners, which are far more cost-effective than repairing the damage later.

[ElisaLee]

The most deceptive aspect of inferior gasoline is the impurities and additives mixed in. I once experienced a situation where the dashboard kept giving false alarms after refueling, and it took four or five attempts to start the engine. The mechanic said this type of fuel had excessive water content, which not only caused engine knocking but also produced acidic substances in the fuel system that corroded metal components. Later tests revealed the anti-knock agents were also substandard, leading to abnormal cylinder pressure. Now, I always smell the gasoline before refueling—genuine gasoline has a faint petroleum odor, while counterfeit fuel has a pungent chemical smell. It's best to add a bottle of fuel system cleaner after the first two refills to minimize engine wear.

[TaliaRose]

After filling up with substandard gasoline, you might initially only notice sluggish throttle response, but after driving a few hundred kilometers, the problems can escalate. In my case, the engine suddenly lost power on the highway, nearly causing an accident. When towed to the repair shop, the fuel filter was found full of black flocculent material, and the injectors were clogged with gum deposits. The mechanic mentioned that such fuel contains manganese compounds, which can form metal deposits under high temperatures, wearing down the cylinder walls. The repair costs were enough to cover three years' worth of premium fuel. Now, I pay attention to the fuel pump's flow rate—substandard fuel often has an unstable flow and bubbles. If you've already filled up with bad fuel, it's advisable to immediately add higher-octane gasoline to dilute it and avoid driving under full load.

[LeHaven]

The most obvious damage caused by low-quality gasoline is decreased power and a sharp increase in fuel consumption. I personally experienced my fuel consumption jumping from 8 liters directly to 11 liters, and the exhaust pipe even backfired during acceleration. Tests revealed that the octane rating didn't meet standards, causing premature ignition, which even burned pits into the piston tops. Even worse, impurities clogged the fuel pump's cooling vents, making it prone to overheating and damage in summer—replacing a new pump costs over two thousand yuan. Since then, I always check the transparency of the gasoline when refueling; good gasoline is as clear as pure water. If you accidentally fill up with bad fuel, remember to immediately add a proper fuel additive—it can break down some impurities and reduce damage, but the most crucial step is to drain and replace the fuel as soon as possible.