After the rollover, the oil in the oil pan flows into the air filter, intake manifold and intake port through the universal pipe of the crankcase. After the MG Roewe Maxus Engine is started, a large amount of oil is sucked into the combustion chamber.

During the compression process of the piston, the pressure on the top of the piston increases because the oil cannot be compressed, and the connecting rod is bent and deformed. After the user has been driving for a long time, the connecting rod suddenly breaks due to fatigue at high speed.

It is possible to determine whether there is oil in the air filter by investigating whether there is a record of rollover accidents, and abnormal traces of piston ring height.

Damage to the crankcase system causes oil to top the cylinder, causing the connecting rod to bend or break. For Bare Engine equipped with a variable intake system.

If the ventilation valve of the diaphragm crankcase is broken, a large amount of oil may be continuously sucked into the intake manifold and gradually accumulated.

When driving at high speed, the intake port becomes a short intake port, and the oil in the intake manifold is instantly sucked into the combustion chamber, causing the top cylinder.