Petrol or diesel? Annual mileage approx. 25,000km

Hall people, First I would like to introduce myself. My name is Leon and I will be 20 years old in the summer. In the summer I also complete my training as an application developer. Currently I already earn above average good because I also work weekends on 450 Euro basis. (I don’t want to mention that the topic comes up that I can’t afford it etc. Currently I drive an E270 CDI Bj 2002 (now W211) This I drove the last almost 2 years 40,000km (currently Running performance : 252,800) It is almost fully equipped and was a gift for my 18th birthday. But due to various problems in the summer the car leaves in March. Now to my actual question / request for help. I drive 4 times a week 100km (back and forth 100km, so one distance 50km) 1 times a week I drive to another location which is about 40km a distance. So I come to about 500km a week. So 25,000km a year (holiday and leisure included (I fa My work path consists of approx. 95% rural road with about 15 villages in between. So much 60-80 km/h for after trucks. Other way via highway is unfortunately not possible and moving is only possible in approx. 2-3 years. Now to my budget: I have saved me over the years approx. 15,000 €. I would like to invest these now meaningfully in a car. For the purpose of insurance I have a deal with my father (instead of Christmas and birthday gifts z So the insurance costs don’t matter to me. What do you think? I’ve already got a lot of information and often come up with different statements. Many tend to be diesel at this mileage per year. Others tend to be more like a petrol engine because of the car part quasi not available. I prefer German car brands. So it should be Audi, BMW, Mercedes or VW if possible. It’s important to me automatic and a nice interior. Small cars are not in question. Oupé, Limo or Kombi I really don’t care about performance should be 160 Ps or more and the engine should be 2 liters or more I hope you look through here and can help me Yours sincerely Leon