What are the manifestations of poor oil quality?

[ElliotFitz]

The manifestations of poor oil quality are: 1. Insufficient vehicle power; 2. Severe engine carbon deposits, shaking, and stalling; 3. Fuel pump failure and inability to start the vehicle; 4. EPC light on the dashboard illuminates; 5. Engine malfunction light turns on; 6. Excessive exhaust emissions. Engine oil, also known as engine lubricant, serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leakage prevention, rust and corrosion protection, as well as shock absorption and buffering. Engine oil consists of two components: base oil and additives. The base oil is the main component of lubricating oil, determining its fundamental properties, while additives compensate for and improve the shortcomings of the base oil's performance, endowing it with certain new characteristics, making them an essential part of lubricating oil.

[LeRafael]

Last time I filled up with substandard gasoline, my engine started shaking violently, as if it were dancing. There was a noticeable lack of power when accelerating, feeling like dragging a big rock uphill. Fuel consumption increased by nearly 15% compared to usual—originally able to drive 400 km on a tank, it could only manage 340 km. Black smoke came out of the exhaust pipe, and there was a pungent sulfur smell. When starting the car, the headlights flickered badly, and I worried it might damage the battery. I quickly pulled over to check and found the engine light was on. Later, after switching to fuel from a reputable gas station, the symptoms gradually disappeared. I recommend everyone choose well-reviewed gas stations, avoid cutting corners for small savings, and address any abnormalities promptly to avoid affecting travel safety.

[DiCody]

As a mechanic who frequently works on cars, I often see the effects of poor oil quality. The engine may produce abnormal rattling or metal friction sounds during operation, which are typically caused by insufficient lubrication due to inferior oil. Acceleration becomes sluggish, and the tachometer needle may fluctuate erratically. Warning lights on the dashboard, especially the exhaust gas warning light, may illuminate. The car may also experience difficulty starting, requiring multiple ignition attempts. Prolonged use of low-quality oil can lead to increased carbon buildup, affecting the engine's lifespan. It is recommended that car owners regularly check oil quality and replace the oil or fuel promptly upon noticing these signs to protect vehicle components.

[LeEsther]

Poor fuel quality directly affects driving safety. I've experienced sudden engine stalling. Insufficient power during startup can easily cause delays at intersections. Fuel consumption surges, about 10% higher than normal. The engine temperature rises quickly, with the overheating warning light coming on, making me worry about engine seizure. Thick black smoke from the exhaust pollutes the environment. Simply put, the car doesn't run smoothly, and if there are any signs of trouble, it's best to stop and get it checked. Ensuring the use of qualified fuel is crucial.

[VonKaden]

After filling my commuter car with substandard fuel, the fuel consumption skyrocketed, costing me an extra two to three hundred yuan per month. The engine runs sluggishly, and acceleration feels like a snail's pace. The vehicle noise has increased, and there's always a burnt smell inside. Upon inspection, the exhaust system was found to be clogged, adding several hundred yuan to the maintenance costs. It's economically unwise, wasting money and time. I've learned my lesson—choosing fuel from reputable gas stations prevents such issues, saving both money and hassle.

[Brown]

If the oil quality is poor, the engine may exhibit abnormal performance, such as noticeable shaking, which worsens when the air conditioning is on. Fuel consumption may increase by 10-20% compared to the standard, and starting the engine may become difficult, requiring multiple attempts. The exhaust may emit an unusual odor with excessive black smoke, polluting the air and causing internal carbon deposits. Through years of car usage, I've found that such issues can easily wear out engine components, and if not addressed promptly, repair costs can exceed thousands. It is recommended to change the oil and perform maintenance in a timely manner to avoid long-term damage.