WHAT IS THE CAUSE OF OIL LACKING IN THE ENGINE?

The most common cause of this problem is worn internal engine components. The engine's valve seals could be leaking oil into the engine.

The main reason is the technology used in the engine. In new technology engines, the metals
are designed in a way that provides high-performance, which leads to oil loss.
In addition, not using oil with the appropriate viscosity and correct performance for the vehicle
and operating at an excessive speed can cause oil reduction in the engine.