Dont want to spoil your new car experience, i traded in a 335i convertable to buy my z....
The expereinece i had was not good, i bought a 2007 from Bmw in chester with 36 k on the clock with 12 month warrenty...heres a list of problems i had over the 13 months of ownership.......
Day 1 had to argue with dealer who had not honoured the propper service agreement...
then car run in Limp mode,, went in to dealer had new , coils, injectors ect ect..
2 weeks later car runs in limp mode again,, back to dealer for new HP fuel pump
Back to dealer with seat rattle, after 3 visits they fitted a new seat
Then failed Mot with Deformed Runflats "Loads of Tread",,, then found out the runflats had cracked the 19 inch rims..
Then had to have rear ball joint replaced as the car was creeking all the time now at 41k
Then windscreen cracked for no vissable reason,,,,,,,,,
Hope you have better luck with yours than i did,, if its got 19 inch rims please go to a good tyre dealer and have them check the tyres and look for any cracks in the rims,, before bmw blame your driving style