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At those miles its likely it may need the DPF cleaned. It can be removed and cleaned by various facilities.
It does clean itself on an ongoing basis, but once enough ash has accumulated inside it has to be physically cleaned or replaced.
With that engine if you remove the DPF you can likely take it to a truck (as in Semi) dealer or a Mercedes Sprinter Dealer and they will likely be able to clean it for you. On occasion the filter won't be cleanable, and you'll have to buy a new one. $$$
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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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