What are the effects of overfilling engine oil in a car?
2 Answers
Overfilling engine oil in a car can have the following effects: 1. Significantly increases the amount of oil entering the combustion chamber, leading to more carbon deposits in the combustion chamber, increasing piston movement resistance, and reducing engine power; 2. Worsens exhaust emissions, severely affecting the lifespan of the catalytic converter, and may even directly damage it; 3. Reduces engine lifespan and may cause engine oil leaks. Engine oil is a lubricant used in internal combustion engines, powering cars, motorcycles, lawn mowers, internal combustion engine generators, and many other machines. The main functions of engine oil are to reduce friction and wear on moving parts and to remove sludge and varnish from the engine.
Having driven for over a decade, I've encountered the issue of overfilled engine oil several times. When there's too much oil, the car feels unusually heavy during acceleration, as if dragging lead weights, and fuel consumption spikes, costing dozens more yuan per 100 kilometers. Moreover, the engine noise increases, especially noticeable as a humming sound at idle, and the exhaust pipe occasionally emits blue smoke—this happens when oil enters the combustion chamber and burns. Over time, this can damage piston rings or the catalytic converter. Once, I had to use an oil extraction tube to remove some excess oil before things returned to normal. Regularly checking the oil dipstick to ensure the level stays between the upper and lower marks is crucial—never overlook this. If the oil level is too high, address it promptly to avoid costly repairs later.
