the charger is usually cleaned or blasted aswell (Jabbasport used a low ish pressure sand blaster) before the new seals and bearing go in, and the timing belt is replaced, also usually, pre oiled (primed) aswell.
But you the owner may have to check that the oil feed line and return are free from blockages and in good conditions, and also the banjos and washers are clean. I remember being so anal over this after having my G60 blow a hole in itself from a blocked oil feed line.