Mine lasted well over doubl that. Highway miles cause very little wear on suspension parts so there is no direct correlation between end of life and odometer.

Every year or so it's good to take the pressure off the springs and push all the ball joints around to see what is worn. You can't tell when the spring is pre loading the joints.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)