I believe that engine has a potential flaw with the oil pickup o-ring that can destroy the motor, but it may have been taken care of already. The o-ring gets brittle from heat then it starts sucking air and oil pressure drops.

I think its an otherwise solid engine....270k is a lot though, especially for a transmission behind the AMG motor.

__________________
-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)