What is Sludge?

1 Answers
Chad
07/29/25 8:17pm
In different parts of the engine, the sludge produced can be divided into low-temperature sludge and high-temperature sludge. The following is a detailed introduction about sludge: 1. Low-temperature sludge: Low-temperature sludge is produced by the combined effect of blow-by gas (containing unburned fuel and water) and engine oil. During low-temperature or short-distance operation, the water and fuel in the crankcase do not completely evaporate, leading to emulsification and the formation of sludge. 2. High-temperature sludge: High-temperature sludge is formed when some larger molecules polymerize under high-temperature conditions, causing the thickening of the engine oil, i.e., a change in the oil's viscosity. Over time, this leads to the accumulation of sludge. This sludge can increase the viscosity of the oil, clog oil passages, and result in insufficient oil supply. Sludge that has formed over a period of time and is subjected to prolonged high-temperature heating becomes hard and brittle, which is referred to as 'black sludge.' Black sludge can lead to increased component wear and even seizure.
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