Will excessive engine oil cause high engine coolant temperature?

[JulianaDella]

Coolant temperature will not increase. The hazards of overfilling engine oil are as follows: 1. Increased fuel consumption: Excessive engine oil raises the oil level in the crankcase, increasing resistance during crankshaft rotation, resulting in poor acceleration and higher fuel consumption. 2. Oil seal leakage: Overfilled engine oil creates excessive oil pressure, which increases pressure on various engine oil seals, potentially causing oil seepage over time. 3. Excessive carbon buildup and catalytic converter clogging: During engine operation, high-temperature and high-pressure gases enter the crankcase through piston ring gaps. To prevent excessive crankcase pressure, the PCV valve forces crankcase ventilation. The high temperature in the crankcase vaporizes engine oil, which is then expelled during ventilation and reintroduced into the intake manifold through the oil-gas separator to participate in combustion. If engine oil is overfilled, excess oil will enter the intake manifold and be burned again. Burning engine oil primarily forms carbon deposits, which can severely scratch cylinder walls, clog piston rings, and block the catalytic converter.