Sounds like the owner hid the problem from you...Sucks people are dishonest.

I can recommend personally rebuilt units at Sun Valley Mercedes, they do a great job over there and its dyno tested.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k