My engine must make a lot of soot, because after running 5k on mobil 1 turbo diesel truck, it was what I would consider "too thick" when I was draining it. So, I switched to Rotella Synthetic and a 4k change....I'm thinking the 20% more often filter/full change on a slightly "lesser" (perhaps not even true) oil is better for the engine than extra miles on a "better" oil. Saves me a little bit of $$ too....and the engine likes it just fine....in fact I think it likes the rotella better than mobil. *flame suit on* 
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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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