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 C230 Tire Wear Caused By Worn Front Thrust Link Bushings
Mercedes-Benz C230 Problem
Average Mileage: 78,750 mi (25,500 mi - 132,000 mi)
Visitor, 2004 Mercedes-Benz C230, 25,500 mi
Dealer said that left front thrust link bushing was worn