What is the reason for the oil in the throttle?

What is the reason for the oil in the throttle? There is oil in the throttle valve because when the engine is running, some combustible mixture will rush in from the gap between the cylinder and the piston ring due to pressure. If it is not discharged in time, the internal pressure of the engine will be too high. Therefore, every engine has a crankcase ventilation valve, and the excess combustible mixture will be discharged from the waste gas valve and returned to the intake manifold to participate in engine combustion. Throttle is a controllable valve, which is used to control air to enter the engine. After entering the intake pipe, it is mixed with gasoline to form combustible gas mixture, which participates in combustion and does work. Throttle is an important part of EFI automobile engine system. Its upper part is the air filter, and the lower part is the engine body, which is the throat of the automobile engine. Whether the vehicle accelerates flexibly or not has a great relationship with the cleanliness of the throttle. @20 19