"Redlining every gear to 80mph".....the 300E is not even close to redlining 3rd at 80mph.....that happens around 118 or so....  Not that I do that regularly or anything. 
The M103 runs extremely good after a real hard run.....seems all MB's love that. My sister's 190E 2.3 was stumbling a bit recently and stalled on her a couple times at idle....so I took it out on the highway for 15 minutes and whupped it.....hasn't stalled or stumbled since!
She drives about 25-40mph 4-6 miles at a time....poor car...always short trips.
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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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