Dacia Sandero 1.6 MPI Lauréate – Used cars – What to look for?

In the next few days I wanted to have a look at a used Dacia Sandero 1.6 MPI Lauréate. The vehicle was built in 2008, 40,000 km was driven and also has an air conditioner. Now I have read the 100,000 km test (AutoZeitung) and also a little look at MT and on the Internet to highlight the typical weak points – but all in all the car seems quite easy. Can you (especially the drivers) give me a few more clues, what I want What is the alternating interval of the tooth rhizome? What about the adjustment of the valve play? When it rusts, where does it start? And and and………. Thank you very much in advance.