525i vs E350 vs C350 – current costs

Hello, I want to buy my first car soon. For this I have a budget of 30,000 euros. However, I want to spend only about 25,000 euros of this, so that I can cover the costs of any repairs or other things easily. My father and I have been discussing for a month now what kind of car it should be. He thinks of BMW (since he has been driving exclusively BMW and he has been working there for more than 30 years -> discount on repairs), I think of Merc edes. But I don’t want to make my car dependent on the discount. He suggested me a 525i BJ 08, I have each picked out a C 350 BJ 10 and E 350 BJ 10. I know that these are completely different vehicles. Unfortunately, we both have different ideas My annual mileage is about 9,000 to 10,000 kilometers. The insurance costs, petrol costs and the tax I already know: Insurance: 100 – 120 Euro/month; depending on the car petrol : 125 Euro/month tax: ~200 Euro/year For inspections and repairs of the two Mercedes I would have expected now about 150 Euro/month, i.e. about 1800 Euro/year. At the BMW I would put it a little lower due to the discount. So about 1600 Euro/year. Unfortunately, one can never say exactly. I would only be interested in which price range I would have to adjust approximately. Personally, I would say that both estimates are a little too high. However, i It would be no problem for me to stop by for minor repairs at a local workshop. There we had our 7s repaired several times and so far everything has always been 1a. I hope you can help me! Another nice evening! Sincerely!