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.
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Still looking for the right fix. Dealer diagnosed Thrust arm bushing cracked but I didn't want to believe him. My front tires have signs of cupping on the inside so something is wrong. A AAA mechanic could not see anything wrong with the bushing. I have noticed the slight and occassional popping sound when making a full right or left, typically in a parking lot. none of the linkages or any other components show visible signs of loseness or play. Once additional noticeable sign is a slight grumble sound that peaks at 18mph and vanishes below 15 and above 25mph. As a result I thought it was bad bearings and I changed wheel bearings, the popping sound stopped for about 2000 miles and then returned slightly less frequent, but it's still there occassionally. I think I will change thrust bushing next or even the entire lower thrust arm with both bushings.