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Yep, check:
-Odometer for accuracy
-Brakes
-Injectors
-Timing Chain Stretch
-Fuel return lines on the engine (the fabric wrapped ones between each injector and fuel filter holder)
-Rubber fuel hoses for leaks
-Fuel lines under the car and back at the tank for any leaks or wetness
If your exhaust is not constantly black/gray all the time then you can be assured its probably not injectors or timing chain stretch. Leaks can often go undetected aside from low mpgs....do a thorough check.
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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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