I bought a new A170 in 2000 (X reg) and ran it until 2012, putting just over 100,000 miles on the clock. In all of that time I had to replace one set of rear springs and bushes (done foc under warranty), a battery, a rear exhaust, a set of front discs, a couple of sets of front brake pads and rear brake shoes, two sets of tyres . . . and absolutely nothing else. Had it main dealer serviced for the first three years, and then used a local independent Mercedes specialist garage for its annual service and MOT. Perhaps I was lucky, or perhaps I don’t work my vehicles hard, but mine was about as reliable and trouble free as you could reasonably expect any car to be.