What are the reasons for rapid engine oil consumption?

[VanDante]

High engine load, excessive crankcase pressure, and large crankcase exhaust gas flow can lead to insufficient oil-gas separation capability, resulting in rapid engine oil burning. Cylinder compression test: Steps such as checking whether the vehicle's power has decreased (power reduction indicates decreased compression ratio) can help determine if there's oil burning. This can be measured using traditional methods like performing a cylinder compression test (or adding some oil for comparative compression measurement). If the cylinder pressure is insufficient, it at least indicates poor piston ring sealing, and the severity of oil burning can also be inferred based on the cylinder pressure readings.