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 C240 Tire Wear Caused By Worn Front Thrust Link Bushings
Mercedes-Benz C240 Problem
Average Mileage: 81,000 mi (27,000 mi - 135,000 mi)
Visitor, 2002 Mercedes-Benz C240, 27,000 mi
Significant oil leak on one side only. Dealer wants $450 to replace both sides.