What are the effects of excessively high engine oil viscosity on a car?

[SanZoe]

Effects of high-viscosity engine oil on a car: Reduction in engine effective power: High oil viscosity increases the resistance of the crankshaft to churning the oil, leading to greater internal power loss in the engine. Difficulty in ignition at low RPM: High oil viscosity requires more torque to rotate the crankshaft during cold starts, resulting in lower RPM and difficulty in ignition. Poor filter cleaning effectiveness: High oil viscosity slows down the circulation speed, reducing the number of passes through the filter, and preventing timely removal of wear debris from friction surfaces. Poor cooling effect: Poor oil flow and slower circulation speed delay heat removal from friction surfaces, resulting in inferior cooling performance and a higher risk of engine overheating. High carbon residue: High oil viscosity leads to larger carbon residue particles and higher solidification points, which can easily clog oil passages.