What are the effects of overfilling engine oil in a car?

2 Answers
McLandon
07/29/25 4:34am
The effects of overfilling engine oil in a car are as follows: 1. Overfilling engine oil can lead to reduced power output and increased fuel consumption: The crankshaft in a car engine requires lubrication to function properly. However, if the oil is overfilled to the point where the crankshaft is submerged in oil, it creates excessive resistance during rotation, resulting in lower power output and higher fuel consumption. 2. Increased carbon deposits: If too much oil is added, it can easily mix with the fuel injection and enter the combustion chamber, where the oil burns. This reduces the combustion efficiency of the gasoline, leading to carbon buildup in the vehicle. Excessive carbon deposits can cause reduced engine power, increased fuel consumption, and other issues that negatively affect the car's performance. 3. Accelerated aging of internal components: When engine oil is overfilled, the pressure between various internal parts of the car increases significantly. Prolonged use under such high pressure can accelerate the aging of these components. In particular, excessive pressure and severe aging of the crankshaft oil seal can lead to oil leaks in the car.
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McRose
08/12/25 8:17am
Last time I changed the engine oil during DIY car maintenance, my hands shook and I overfilled it by half a liter. After driving for a few days, I noticed the car wasn't performing well - sluggish acceleration and abnormally high fuel consumption. Later, I observed blue smoke coming from the exhaust pipe. My mechanic friend explained that excess oil increases crankcase pressure, which can rupture oil seals and cause leaks. More seriously, the high-speed rotating crankshaft whips the oil like an egg beater, creating foam that reduces lubrication effectiveness and accelerates engine wear. The most alarming issue is that surplus oil gets sucked into the combustion chamber where it burns, producing blue smoke and poisoning the catalytic converter. Eventually, I had to buy an oil extraction tube to remove the excess through the dipstick tube before the car returned to normal operation.
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