Coal black oil is not indicitive of a serious engine issue. Every diesel I have ever had, including my current 83 300D, 2002 TDI, and 2012 ML350 turn fresh oil coal black within a couple minutes of starting. Its a diesel thing

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)