What Are the Effects of High-Viscosity Engine Oil on a Car?

1 Answers
DelSophia
07/30/25 7:58am
The effects of high-viscosity engine oil on a car: 1. Reduces the effective power of the engine. High-viscosity oil increases the resistance to crankshaft oil stirring, leading to greater internal power loss in the engine. 2. Makes ignition difficult at low speeds. High-viscosity oil requires more torque for crankshaft rotation during cold starts, resulting in lower speeds and difficulty in ignition. 3. Poor filter cleaning performance. High-viscosity oil circulates more slowly, reducing the number of passes through the filter and failing to promptly remove wear debris from friction surfaces. 4. Inferior cooling effect. The poor fluidity and slower circulation of high-viscosity oil result in slower heat dissipation from friction surfaces, leading to poorer cooling performance and a higher risk of engine overheating. 5. Higher carbon residue. High-viscosity oil tends to have larger carbon residue particles and a higher solidification point, which can easily clog oil passages.
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