I wonder how many 240's can run at 85mph constantly....you're near the redline there! Not to mention thats 15-20 over the speed limit in all US States...  .
Also, MB says to change the oil. So do it. Somehow I can guarantee the engineers that designed the car and engine know more than you. A whole lot more. And they say to change it, thus, probably a wise idea.
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-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)
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