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I also have a 2010 GLK with almost 33k miles and 6 more months of warranty left. My story is the same. First they replaced the bearing. When I returned with the same problem (high pitch noise starts over 40 miles per hour) they asked me to drive with a tech on board. He did not say much but I can see from his reactions that he knew that it was a major problem. They kept the car 2 more days. To me it meant MB rep had to come over and make the expensive decision. I was going away for a week so did not mind them to keep the car. When I returned several warranty fixes including a brand new transmission were completed. The dealer service personnel were very responsive and helpful. Only time will show if I have a lemon. Luckly I had purchesed mechanical breakdown ins up to 100k miles.Report it
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