My company car is a VW Touran 1.9 TDi which I have had serviced at the local VW main dealer four times. After each service I make a point of checking the oil level before driving away and I have been surprised each time that the oil has been rather black and dirty looking.

Until now I have done my own basic servicing at home and experience tells me that (even on diesels) the oil starts clean and progressively gets dirty with use over hundreds of miles. My hunch is that they aren't allowing the oil to drain for long enough or are extracting it from the dipstick hole. Have you come across this before and should I be concerned?