Irregular and premature tire wear can be caused by the front thrust link bushings cracking and causing excessive movement in the suspension. The thrust link bushings are fluid-filled (to help reduce vibration), so if they crack, they will leak oil.
Car Problem Reports
Mercedes-Benz C350 Tire Wear Caused By Worn Front Thrust Link Bushings
Mercedes-Benz C350 Problem
Same issue with inside of both fronts worn to the threads & wires while mid and outside retaine usable tread. Not very noticeable as tires never rotated due to rears having different tire size on our Sport model. Could have been very dangerous if not caught. This happened even though car had "camber kit" installed many miles ago by the dealer due to pulling to the right. Now with new Micheline Pilots and a fresh alignment, car pulls again and ride is not as smooth. Left a VM today for svc at Mercedes Benz Knoxville, mentioned the Thrust Link Bushings; have yet to hear back. Will update as dealer responds.