All I know of about the new V6 diesel is that fleet of 4 E-class models that MB had touring the US a while ago, and they did that 100,000 mile nonstop "endurance race" which they all passed with ease, and then went on to tour the country....so I'd say they are pretty reliable...

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)