What are the effects of adding too much engine oil on a car?
2 Answers
The effects of adding too much engine oil to a car include: 1. Increased fuel consumption and reduced power. If the oil level is too high, a significant portion of the crankshaft will be submerged in the oil, causing increased rotational resistance as it agitates the oil during rotation; 2. Accelerated carbon buildup, damaging certain car components. Burning engine oil also produces a toxic gas that can cause the catalytic converter to fail and the oxygen sensor to become poisoned, thereby affecting the car's performance; 3. Crankshaft oil seal leakage and shortened oil shelf life. Excessive agitation of the oil increases pressure in the crankcase, which acts on the crankshaft oil seal, accelerating its aging and deformation, ultimately leading to leaks. It also speeds up the oxidation and deterioration of the oil, reducing its shelf life.
I've driven all kinds of cars, and experience tells me that overfilling engine oil is definitely bad. The engine requires precise oil levels to lubricate internal components. Once it exceeds the upper limit, oil pressure rises abnormally. This forces oil into the combustion chamber, causing blue smoke when burned—not only does it smell terrible, but it can also clog the catalytic converter. Over time, piston rings and oil seals can get damaged, leading to leaks and even engine overheating or fire. My old car suffered from carelessly overfilled oil—it ran noisily, fuel consumption skyrocketed, and I ended up spending thousands on major repairs. During maintenance, always check the oil level with the dipstick and keep it between the min and max marks for safety—don’t cut corners by pouring extra. Remember, excess oil harms the engine, reduces lifespan, and affects overall performance. Regular checks are key—don’t lose big over small savings.
