What is the sludge on the engine surface?

The causes of oil sludge on the engine surface are: 1, bad car habits; 2. Improper car maintenance; 3. Poor engine oil quality; 4. The gap between piston ring and cylinder wall is too large. Cleaning methods of engine surface sludge are: 1, using cleaning agent; 2. Disassemble the engine for cleaning. The effects of sludge on the engine surface are: 1, which reduces the heat dissipation capacity of the cylinder block, resulting in too high oil temperature and reduced engine power; 2. Increase the flow resistance of engine oil, reduce the flow of engine oil, and affect the lubrication effect of engine oil; 3, blocking the engine oil circuit, resulting in insufficient lubrication between engine parts.