What Causes Sludge in Car Engines?

[OwenLynn]

Here are the reasons for sludge formation in engines: 1. When the car frequently operates at low speeds. At this time, the crankcase temperature is low, and combined with the higher fuel injection volume during low-speed operation, some incompletely burned gasoline enters the crankcase, resulting in low-temperature sludge. 2. When the crankcase ventilation valve is partially or completely blocked by oil impurities or sludge, waste and water vapor inside the crankcase cannot be discharged in time, leading to sludge formation. 3. To improve fuel economy, some high-performance direct-injection engines on the market use a technology called lean combustion, which reduces fuel injection. Coupled with China's poor fuel quality and lean combustion, the exhaust gases entering the crankcase have high nitrogen oxide content, causing sludge. 4. The low quality of engine oil and gasoline is also a cause of sludge formation. Additional information: 1. Sludge is formed when impurities generated in the crankcase during engine operation combine with the thickening of the engine oil itself under high temperatures, resulting in deposits adhering to the engine camshaft, crankcase, oil passages, oil pan, and other locations. Both sludge and carbon deposits are harmful substances that are very detrimental to the engine. 2. If sludge appears inside the engine and is not too severe, engine cleaning oil or internal engine cleaner can be used for cleaning, which can yield good results. If the internal sludge is too severe, a complete engine disassembly is required for thorough cleaning.