What Causes Severe Jerking After an Oil Change?
2 Answers
The reasons for severe jerking after an oil change are as follows: 1. Engine oil: The oil does not meet the standard or too much oil has been added. 2. Break-in period: After the break-in period of a new car, the engine noise may increase, and fuel consumption decreases. 3. Viscosity: The new oil has higher viscosity, leading to greater mechanical resistance and increased cylinder pressure. The functions of engine oil are as follows: 1. Lubrication: During engine operation, the friction between components is rapid and intense. A sufficiently thick oil film is needed between the piston and cylinder to separate the two components and reduce friction. 2. Cooling: The engine generates a lot of heat during operation, and the oil carries some of this heat back to the oil pan for dissipation. 3. Cleaning: Engine parts can produce oil sludge, carbon deposits, worn metal particles, and inhaled dust, which can easily form carbon buildup.
After changing the engine oil, I clearly feel stronger jerking when driving, which is really strange. I suspect the oil might be overfilled - check the dipstick. If the oil level exceeds the upper limit, it can easily cause air bubbles and poor lubrication, leading to engine vibration. Or perhaps the oil viscosity is too high, like using thick winter oil in summer, which would make cold starts feel rough. Another possibility is that the old oil wasn't completely drained, mixing with new oil and changing viscosity, affecting engine response. I suggest you quickly measure the oil level - it should be between the upper and lower marks. If it's too high, drain some out and don't force the engine. Also, check if the oil filter is properly installed - incorrect installation can cause leaks and affect oil pressure. If you find any issues, return to the repair shop early for adjustments to avoid damaging engine lifespan.
