i had the same experience at my local dealer...except at 1 year and 11k miles and no coupon! i was furious that they would suggest a service that bmw doesn't recommend under scheduled maintenance at all, much less on an almost new car that is exhibiting no problems of any kind (except for my tpms error which so far they refuse to look at). i have been going to this dealer for about 10 years for service and this was the first time i ever had to take them to task on the ratings. they didn't like it one bit, but that's what you have to do to keep this stuff from getting even worse.
2015 M235i, MW/Bl, all packages
2012 x3 m sport, carbon black, prem, tech, conv, etc
evil the following 29'er, specialized carbon stumpjumper s works fsr, trek madone 5.2
nikon d500, d810, d750, 14-24, 24-70, 80-400vr, 500vr