Why does the engine burn oil at high speeds but not at low speeds?

[EmersynDella]

Engine response to differences in oil viscosity is quite noticeable. The higher the temperature, the thinner the oil becomes due to improved fluidity, leading to more severe leakage. Once an engine ages or develops defects, this phenomenon becomes most apparent under high-temperature conditions. This explains why some vehicles consume more oil during prolonged high-speed driving compared to low-speed urban driving. Even for engines with oil burning issues, using thicker oil can alleviate the problem, while low-viscosity oil tends to worsen oil consumption. Below are detailed explanations: 1. Explanation one: There are numerous intricacies regarding engine oil. Determining oil quality isn't based on just one or two parameters, but rather a comprehensive evaluation of all factors. 2. Explanation two: Thinner oil can improve fuel economy, but excessively thin oil may cause insufficient lubrication at high temperatures. High-quality oils maintain excellent high-temperature protection performance even when relatively thin.