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I used this ML 320 for 2 years and 10 months, drove ca. 45,000 km and had it for over 3 months in unscheduled repairs and was for these times mostly without courtesy car. Some of the repairs were minor - others unacceptable. Here a short listing: 

1. The 2nd day with 180 km the red engine light came on - this suppose to be a serious issue. It turned out to be the emission valve - a known problem.
2.  Some of my friends pointed out that all the studs are rusted - a common complaint but the dealer exchanged them after 2 years and 10 months.
3. Also noticed some upcoming rust on the drivers door. It was pointed out to the used-car manager and the service department, but never repaired
4. The wind deflector off the sun roof would not stay up at speeds over 90km/h. The dealer was not able to fix this - and additional external deflector did not work out.
5. The ashtray would not close
6. Rock chips appear on the hood, passenger doors and tail gate at a unacceptable rate
7. Engine looses power, wipers are going wild, horn hunks in intervals all dashboard lights are flashing. The car was returned twice without a change, then the dealer found a faulty ground to cause the problem - after 3 weeks. I was without car.
8. Air conditioning quit - was repaired about 6 times to work just for one day.
9. Brakes needed to be replaced at 29,000 km (20,000m) at $650.00.
10. Rear tire blew. This can happen, but it took 4 days to replace it. Tire stores do not carry the make "General" and not the size the ML takes.
11. Heating at -25 Degrees C - is definitely not sufficient. You freeze or the windows fog up.
12. The transmission shifts really hard when the car is cold. I was told this is normal - although I never had that with any other car.
13. Steering squeaks - I was told that was the alternator - was exchanged under warranty
14. Muffler makes terrible noise - apparently it was the catalytic converter that cracked - it was exchanged under warranty
15. Check-Engine light comes on again - this time it was the Air-Flow Sensor which was faulty - got it exchanged under warranty.
16. Cannot lock or close drivers door. Interior door handle was loose. It took 2 visits to get this fixed.
17. Air conditioning fails again. Lone Star exchanges the A/C compressor.
18. After 2 days A/C fails again - it takes 4 days to book the vehicle in. After I dropped off the car I get the phone call that they will have to order parts - but I can drive the car without A/C. Well it was blowing hot air at 30 degrees C.
19. Dropped the car off to get repairs done. It took another 2 weeks. The A/C compressor was gone again - the first time they did not flush the system.
20. They finally exchanged the wheel studs.
21. Dealer refused to do anything about the rattling sun roof
22. Dealer refused to do anything about the ash tray
23. Dealer refused to do anything about the rock chips

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