I change my oil about every 5,500-6,000 miles and this is a perfect (slightly conservative) schedule as verified by the oil analysis I had done by blackstone.

I use Liquimoly 5w30 low ash synthetic. (light blue bottle) and a Mann filter generally (or MB)

The emissions system isn't that big of a deal. Considering how everything else on the car is about 5x as reliable as the old ones I don't mind if I have to change an occasional sensor or Clean the DPF out every 50-70k miles. The relentless torque and driving dynamic makes it well worth it. Not to mention close to double the average fuel economy I used to get with my 420SEL. Really adds up when driving 1,500 miles+ a month!

Plus, they don't rust....at all, thats HUGE.

__________________
-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)