New BMW owner. New Club member. First post. I am looking for opinions on whether or not to change the "lifetime" automatic transmission fluid on my E39. It is a 2001 540i sport with 94k miles. I bought it 3 months ago and have thoroughly enjoyed the car. The car runs and shifts fine. I have no noises or other symptoms of tranny problems. My BMW mechanic (private BMW shop; not a dealer) says he does not believe the tranny has been serviced and he says that even at 94k I should go ahead and do the service now. My brother the Benz technician (Can I write "Benz" on this site?) says I might want to leave well enough alone and not "stir up" whatever might be in there at this point. I have most of the service records on the car and other than the neglected tranny service, all of the regular maintenance (fluids, filters, hoses, etc) has been performed at proper (i.e. NOT BMW extended) intervals and with correct parts/materials. I really like my E39 and am hoping to keep it as my daily driver for several years/miles. Please let me know if you think it is too late to service this AT or if I can have it serviced and not worry about creating problems that do not currently exist. (If I decide to have the transmission serviced now, I plan to get on a "regular" schedule (60k miles?) for future ATF swaps to help extend the life of my transmission.) Thanks for any opinions.