Types of damages
One of the reasons of the damage of a turbocharger can be a strange object in the intake piping, which can caused the larger damage of an engine or its other components.
The irregular maintenance or any contaminants inside the motor oil are other reasons of the above mentioned damage.
Correct lubrication of a turbocharger is necessary for its running. Insufficient lubrication of a turbocharger causes its depreciation.
Last but not the least, it is important to avoid engine and turbocharger overheating.
One of the following pictures you may see the difference between the original state and the state of the damage of the turbocharger which has been caused by one of the above mentioned reasons.