Why is diesel entering the engine oil in a China V Cummins engine?

[Long]

In a China V Cummins engine, diesel entering the engine oil may be caused by damaged fuel injectors, which inject excessive fuel, leading to unburned fuel entering the engine block. Alternatively, one or more cylinders may not be functioning, causing high pressure or unburned diesel in the cylinder, which then seeps past the piston and cylinder wall into the oil pan, resulting in diesel contamination in the engine. Other possible causes include poor fuel injector atomization or excessive clearance between the piston rings and cylinder wall. Classification of engines: Based on the power source, automotive engines can be categorized into diesel engines, gasoline engines, electric vehicle motors, and hybrid systems, among others. Engine principles: Common gasoline and diesel engines are both types of reciprocating piston internal combustion engines, converting the chemical energy of fuel into mechanical energy through piston motion to generate power. Gasoline engines typically have higher rotational speeds, lighter weight, lower noise, easier starting, and lower manufacturing costs. Diesel engines, on the other hand, have higher compression ratios, greater thermal efficiency, and better fuel economy and emission performance compared to gasoline engines.