Update on mine:
It uses about a quart per 800-900 miles....and gets oil on maybe 3 of the spark plugs pretty good....and a little on another. Two of them remain pretty much clean/dry. Valve stem seals are the culprit...and they're getting replaced next week. I'd not do it, but those plugs that get oil on them foul up and misfire after about 500 miles....and its getting annoying. So I'm getting it taken care of so I don't have to keep cleaning/replacing spark plugs and adding oil. That will save $$ in the long run. 
Other than that, I've driven it just about 7,000 miles since November and it runs great and is very reliable/powerful.
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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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