Just did my air and diesel filter yesterday. Air filter looked as bad as yours. Car has 170k miles and no mention of diesel filter in the service history. Got both filters from audi with trade discount for €110. The diesel filter i cut open afterwards and out spewed some very dirty gunge. The paper filter inside was covered in a slimy gloopy sludge aswell.
I had a slight shudder throughout the car at low revs, most noticable at 70-80mph even on glass like roads, I was convinced there was a gearbox issue and was lining up a fluid change. The shudder is gone after the filter changes so i guess it was partailly blocked and starved of fuel at low revs.
A lesson to start simple!
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A8 D3 3.0tdi quattro 2006
A6 C5 1.9tdi 2004
A4 B5 1.9tdi quattro 1997
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