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.Google+
Car Problem Reports
Mercedes-Benz C230 Tire Wear Caused By Worn Front Thrust Link Bushings
Mercedes-Benz C230 Problem
Average Mileage: 89,625 mi (25,500 mi - 132,000 mi)
Visitor, 2006 Mercedes-Benz C230, 117,500 mi
Worn front stabilizers both (L) and (R)...
Visitor, 2007 Mercedes-Benz C230, 83,500 mi
Right 3 month after my extended warranty expired, dealer found front thrust arm bushings cracked, and needs to be replaced.
Visitor, 2004 Mercedes-Benz C230, 25,500 mi
Dealer said that left front thrust link bushing was worn