"Turbos can also be problematic if not properly maintained.
Change the oil at least every 5K miles and cool down the car properly EVERYTIME before you turn it off. Not doing this is the single biggest killer of Turbos and the fix is the easiest and cheapest you could ever hope for.

Before turning off the car after reaching your destination - simply let the engine idle for at least 30 seconds (preferably a minute) and you can rest assured that you are getting thousands of additional miles in return. The oil has a chance to properly cool down the turbo if allowed to circulate for a bit."