I just got 328i convertible with 71k miles and all BMW serviced. What parts start to go when? I know about the need to change transmission fluid and filter. I've seen reports that the electric water pump dies around 70 to 110k. I don't know if this is the common range or unusual. I'd prefer to replace before things die or at least have them on hand. I plan on keeping this at least another 100k miles.