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If that is brown instead of black, they are normal. However, they should be LIGHT brown to light tan, any hint of black on the center electrode means running somewhat to very rich. You can check that with a duty cycle meter (or plain digital VOM) between pins #3 (red lead) and #2 (black lead, ground) on the diagnostics connector on the left fender -- the one with the round screw-on cap.
If they are oily at all, you have bad valve guides most likely.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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