up to 10,000€, BMW, Audi or something else?

I am currently looking for a new vehicle. My current BMW E34 520i now has 350,000 kilometers down, the Tüv is also on the line in the summer. So far I was perfectly satisfied with the BMW. The only thing that bothers me a little is the high consumption of about 9-10l. Now I have looked around. It should be something robust, durable and reasonable again. A car that stands around the workshop a lot and has one problem after another I do not need one more time. l. I have already been able to experience this with my Audi A4 B5, on this car everything was broken which could break. For my budget of 10,000€ I want just as much car as I can anywhere, from BJ 2007; from 160 hp, max. 150,000km (should still run 100,000 without great problems), and just be reliable. Furthermore, I am relatively large and framed (195cm approx. 110kg), so the car can offer me a little space, trunk and rear seat ban. k is not so important to me now. In the eyes of me much of the 5 Series BMW E60 and the Audi C6 I am also open to other suggestions. What can you recommend to me, how are the experiences with the E60 or C6, which car suits me best? The 3 Series BMW and A4 just don’t tell me completely, but are also not excluded.