I've had a 2008 E class estate for 7 years but 220 with 5 speed auto so completely different engine and box. Rear arches are starting to show surface rust at front edges on both sides - the arch liners have foam material attached to the back for sound deadening but these hold water which I think is the cause, I've also had to have some brake pipes replaced for MOT a couple of years ago that run just below these liners and consequently get water running down them for most of the year. Can't see any rust anywhere else... Other issues, a leaky injector, a snapped front coil spring (fortunately when parked), the odd suspension ball joint for MOT, etc. Outboard rear parking sensors (behind back wheels so get all the crap thrown at them) I have replaced myself, easy £22 ebay DIY job as they can be reached underneath. Electrics otherwise have never missed a beat, still on original battery (looks like one from a truck) and I can't remember ever replacing a bulb... Very quiet car at 80mph with minimal wind noise - something I really notice on later cars, do they have thinner glass? And with a spare set of alloys with winter tyres has been surprisingly good in the snow, got up the hill to our house when neighbours X5 couldn't keep traction... Good workhorse, hope the above might be of some help if you see another one..