Some data to share. See what is covered and whats not here:
http://www.bmwusa.com/standard/conte...contracts.aspx
Prices For M235x (with nav & HK):
Platinum:
7yrs / 75,000 miles: 3749
7 yrs/ 100,000 miles: 4179
For Gold
7yrs / 75,000 miles: 3309
7 yrs/ 100,000 miles: 3689
I have 3.5+ years left on my warranty. But assuming I still have the car - I will be buying 7/75 Platinum in Year-4 post service date.