What are the effects of adding too much engine oil on a car?

[LeIker]

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.