not a mercedes, but a guy I worked with had a very nice dodge daytona. he was having trouble with low power and surging, and it would stall at stop lights. went to the dealer a couple times at 2-3 hundred a pop and still the same issue. he sold it to me. I took it home, turned the key 3 times and it flashed bad map sensor code and bad ox sensor code. replaced the map since it was upstream and problem solved. I offered to sell it back to him with just the extra $50 for the sensor but he said no, deals a deal. I sold the car to my brother for 1050 and he drove it 3 years. Had the dealer work on it again and it caught on fire on the highway. insurance settled for $3800 so he gave me $1400 of that......

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)