X4 new car is 200km, and there is oil leakage at the throttle.

Some of what is said upstairs is right, but some of it is not mentioned. GL8 2.4LT is an electronic throttle, and there is no idle motor. It is completely adjusted by the computer. Generally speaking, if the idle speed is unstable, it should be cleaned first and then synchronized by the computer.

Also, after cleaning, fuel consumption will definitely increase. This is not only this car, but also most cars. But don't worry, if there is nothing wrong with other parts of your car, it will take a while.