What is the warning on the trip computer?

Hello guys. While coming from Erdey to Bursa, the petrol warning lamp came on, I saw almost the bottom of the tank until I had to go home because I had no cash with me. I went towards the evening and bought diesel from Opet. As I was walking on the road, I heard the famous "shit, shit" sound, a warning appeared on the information screen for a long time, but I was only able to read the text "diesel fuel". But there is no change in the vehicle. I searched on the internet, but I did not come across such a warning. What is this?

I think your vehicle gave the message "Diesel additive minimum level". A contribution that needs to be changed or added every 120.000 km. Service route has appeared to you my friend :)

Does it cause any problem, this diesel additive is less?