Torque thrust bushings in the front suspension may crack and leak oil, this causes steering alignment problems and excessive tire wear. Another symptom of a worn bushing is a clunk or thud noted when turning, on hard acceleration, or hard braking.Google+
Car Problem Reports
Mercedes-Benz CLK63 AMG Torque Thrust Bushings May Crack and Leak Oil
Mercedes-Benz CLK63 AMG Problem
Visitor, 2007 Mercedes-Benz CLK63 AMG, 83,000 mi
same problem as described: leaking fluid from the bushing. I'm about to go back to give the dealer a third try at repair on his nickle.