20 1 1 touareg is it necessary to clean the throttle?

Because the crankcase ventilation leads directly to the intake pipe at the front end of the throttle. The ventilated gas is oil and gas, which will accumulate into scale at the edge of throttle valve over time. Although the throttle can be adjusted by itself, if it is too much, it will exceed the adjustment range of the throttle. So it needs to be cleaned regularly.