I purchased my Z4 new in Sep. 2008 and have just under 20,000 miles on it now. I have the oil changed twice a year and one change is covered by the maintenance program. But, I am trying to find out what the maintenance intervals are for other items. I just took my car in for its annual oil change and inspection. The manual states that the car needs to have brake fluid replaced every 2 years. I had to specifically ask for this to be done, and first they tried to charge me for it. The owners manual is very vague about what is to be done as routine (covered) maintenance and at what time or mileage intervals. Is there a clearly defined maintenance schedule for this car? Any help would be appreciated.