Is your car manual (mine is) or automatic. Change fluids, even those that BMW says are "lifetime". Coolant for sure, use only BMW coolant. Engine oil every year. The normal air, oil & fuel filters as well as pollen filter. Brake fluid every two years (and clutch as well, if your car is manual). I'd also recommend you retrofit magnetic drain plugs in your transfer case, diffs and (manual) transmission. I wrote an article on this (in the forum) and a follow-up for the BMW CCA magazine.