Anyway, what do you guys think about the 30k oil/filter service intervals?
Almost all the 330i cars that are on mobile.de or autoscout24 have 30k intervals in their service books, and that's all the way from 0km to 200k+ km
Because people take their cars to the workshop when the CBS tells them to do so 
I drove my previous M50B20 with the same interval without any problems for a couple of years and more than 150.000km. I have to admit that I was doing about 1100km a week autobahn only. After 25k the oil still looked like new.
Besides that it shouldn't make a difference in getting a car from any part of Germany if you're concerned about salt. In Rhein-Main area, where people start getting weird if it's below 0°C, the streets are white of salt from November until April.