I have a 2019 DS HSE (177kw petrol) that I took delivery from the dealer in mid-June. The DS has roughly 4500 miles on it. Last week at startup I started getting getting a message in the instrument cluster telling me that service is due in 1800 miles. That seems awfully soon. I have read that the first service is at 16K miles, which is a long way from 6k to 7k miles. What do you suppose this is?