I've never seen or heard of one failing from oil pressure loss....in fact other than basic stuff like cleaning the MAF, replacing spark plugs and replacing belt/pulleys etc, I've never encountered ANY failure on an M112 Even on ones with over 200k on them...

Mine has 156k on it and I still regularly drive it flat out to 6k rpm between shifts, it doesn't care.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
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'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)