Why Does the Engine Have Sludge?

[VanLayla]

Reasons for engine sludge formation: 1. The car frequently operates at low speeds. At this time, the crankcase temperature is low, and the fuel injection volume is relatively high during low-speed operation, causing some incompletely burned gasoline to enter the crankcase, resulting in low-temperature sludge. 2. When the crankcase ventilation valve is blocked by oil impurities, sludge partially or completely clogs it, preventing the timely discharge of waste gases and water vapor inside the crankcase, leading to sludge formation. 3. To improve fuel economy, some high-performance direct-injection engines on the market use a technology called lean combustion to reduce fuel injection. Poor fuel quality in China, combined with lean combustion, results in exhaust gases entering the crankcase with high nitrogen oxide content, causing sludge. 4. Poor quality of engine oil and gasoline can also lead to sludge formation.