My 617 with 241k that regularly travels 85-100mph for significant distances doesn't burn any, I lose maybe a qt every 3000 miles from normal "sweating and dripping" and probably from blowby too....doesn't burn any though.  Nor does our 617 with 271k on it, and it has 0 blowby and 0 drips, so it looses nothing at all over the 3000mile intervals. Both run Rotella-T 15w40 dino oil @3k changes year round.
*has hijacked a 603 thread.
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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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