I have owned this car for 10 years now and i am still trusting it. It had some minor problem but so has every car. The only problem is the interior parts are not very durable. Little things like the door panel, handle, seat panel etc. Otherwise, it is a very reliable car. In fact, it is more reliable than my newer BMW 7 series. I will get another Benz because of the reliable engine and trans and the comfort, not sure if it will be an SUV but might consider the E class. the m class is pretty worth it for the price and re sell is not bad at all.
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