Here's a snippet from www.honestjohn.co.uk
"General Warning about Automatic Transmissions: Many BMWs have "sealed for life" automatic transmissions. Regardless of whether you have a full BMW service history, the dealer will never change the auto fluid. Many of these boxes are failing around the 120-150k mark - often well outside of warranty and to a cost of £3.5k plus VAT. A good independent or automatic transmission specialist can and will change the fluid for you (and any good BMW independents will recommend this anyway). This is
commonplace in the US and means the 'box should last the life of the car rather than being the cause of it being written off. General advice is ensure the fluid is flushed out every 60k or more preferably at each Inspection II."
note this is from a UK website, so those mileage figures are in miles.
to read the whole thing go to http://www.honestjohn.co.uk/index.php?url=/carbycar/index.htm
and select BMW 5series E39
"General Warning about Automatic Transmissions: Many BMWs have "sealed for life" automatic transmissions. Regardless of whether you have a full BMW service history, the dealer will never change the auto fluid. Many of these boxes are failing around the 120-150k mark - often well outside of warranty and to a cost of £3.5k plus VAT. A good independent or automatic transmission specialist can and will change the fluid for you (and any good BMW independents will recommend this anyway). This is
commonplace in the US and means the 'box should last the life of the car rather than being the cause of it being written off. General advice is ensure the fluid is flushed out every 60k or more preferably at each Inspection II."
note this is from a UK website, so those mileage figures are in miles.
to read the whole thing go to http://www.honestjohn.co.uk/index.php?url=/carbycar/index.htm
and select BMW 5series E39