Hi I have a GLE 250, coming up to six years old, but only 20,000 miles on the clock. Steering goes on a round about, as if someone is trying to wrestle the wheel from you. get it off the roundabout and stop. steering is extremely stiff, limp home (4/5 miles) and get it recovered next day. Told it needs a new steering rack, I find it incredible that happens in 20,000 miles. no off roading, nothing excessive, I am retired so only family travel, I just cannot understand why this should fail. anyone any notions? or similar experience. I took reliability for granted with the name Mercedes.