I don't know about "tanks" I'll believe it when our W124 goes longer between needing repairs than my W126.... so far the 300E has only made it 1.5 weeks incident free in my ownership....I think I've got it good to go for now though.
My W126 has not had ANY repairs for 15 months now....just oil/trans fluid changes. Oh, and my last "repair" was front brake pads over 1.5 years ago.
W126 = tank
W124 = expensive
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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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