Mine has had a similar amount of blowby the entire time I have owned it so far (from 207k to 230k currently) and it will start reliably without a block heater down to -10F, and it has a LOT of pep and power and will haul the car to 110mph no sweat. Mine dies after about 7-10 seconds of plugging the breather tube. I'd say, don't worry about it, just keep on changing the oil every 3k and enjoy the next 100-150k   I highly doubt your engine is even close to needing a rebuild.
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
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'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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