There's really not much you need to do. Just follow the scheduled maintenance (schedule I & II). My car is a 97 528i with 136k. Some of the things to look for are the radiator and the water pump average about 80K, so those will need to be replace in 1-2 yrs. I am not sure about the transmission fluid on a 2001, but a lot of the older models had sealed transmission cases, so BMW doesn't recommend changing the fluid (if it's sealed) but they can and I recommend it at about 80-100K and so do the majority of the independent mechanics.