Cheaper, younger car than my

Hello, have been driving an old dinosaur name Mercedes C180 W202 year 95. The car eats fuel and is too expensive for me in insurance, taxes and repair costs. Is a younger compacter like Golf 5, 6, or 7 with more/equal performance in all matters cheaper in the maintenance (in the individual points)? Petrol I am looking for a slightly younger used up to approx. 6 thousand euros. Pain limit 8 thousand euros. Absolute death limit 10 thousanduro. I am thinking: If a Golf 5 or 6 is cheaper in the maintenance, then I would like to have one like that. If a younger BMW 3 or a younger C class does not cost much more in the maintenance, I would prefer the cars. What do you say?