What are the effects of excessively high engine oil viscosity?
1 Answers
The effects of excessively high engine oil viscosity: 1. During cold engine starts, the oil flows too slowly. Although oil pressure is high, the volume of oil passing through is insufficient, resulting in poor pumpability. This increases wear on the engine from startup until oil reaches the friction surfaces. 2. With high oil viscosity, the torque required to rotate the crankshaft during cold starts increases, leading to lower rotational speeds and difficulty in ignition. 3. High oil viscosity slows the circulation rate, reducing the frequency of oil passing through the filter. This hampers the timely removal of metal particles, carbon deposits, dust, and other impurities from friction surfaces, resulting in poor cleaning performance. 4. High oil viscosity leads to larger residual carbon particles and a higher solidification point, increasing the risk of oil passage blockage.