It would appear so. My wife's 06 530Xi sport wagon they changed the brake fluid at two years. When I asked about our 07 X3 I was informed that this was now to be done every 3 years. The fuel filter is to be done at 100,0000. The air filter is way to long too. I can't recall what I was informed here. I too change my oil between "recommended" intervals. Every 7k including filter of course. Prices at the dealer seam at times way high for common proactive maintenance and repairs alike. I understand having to make a profit but $1800.00 to replace a $300.00 starter is .........you fill in the blank.
Now I just had the 30,000 maintenance done on our 08 M3 and they did replace the rear dif fluid however I was informed this was an oversight by the service writer and it is not part of the scheduled maintenance.