If it possible try to upgrade NAV software to V24 version, transmission software, let them replaced brakes and rotors, flash brake system, coolant, motor oil, microfilter, oil filter air filter, windshield and rear window wiper blades, remember about 8 CV joints let them check this too, tranny fluid also would be nice to change, look under the car and check with flashlight for any leaks etc, if you can buy extended warranty from BMW dealer, so U will be covered for another few years up to 100.000 miles.