My 02 c320 has just had the front links replaced for the second time. First time was around 20k mi (they had been clattering for at least 6k mi), this time around 43k mi, both under warranty.

The tech said they are a maintenance item, but said 20k mi is unusually low for them.

The good news is I hear they are fairly inexpensive, and easy to replace. I hear BMW guys saying theirs fail commonly also.

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2001 e320 wagon
2004 F350
2006 Crown Vic