Quote:
Originally Posted by trader4
If BMW defines the lifetime of their cars as 100K miles, they should put that in the sales literature. It should do wonders for their sales. You would think BMW would define exactly what "lifetime" means, but if they have, I haven't seen it anywhere. And it's certainly an important thing that should be clearly spelled out.
|
As we all know a BMW service mgr. does not speak for BMW. Undefined, lifetime means you never need to change it. In the handy dandy Bentley version of the BMW service manual, lifetime is defined as--No oil change is required for the entire service life of these transmissions. It also says if repairs have to be made to the transmission or transmission oil cooler, use only the recommended lifetime fluid to refill. Under troubleshooting a transmission--Minor automatic transmission problems may be corrected by changing the automatic transmission fluid (ATF) and filter. It goes on to explain how to diagnose the problem which would identify if a fluid change is needed. There is nothing that even implies don't ever change the fluid if the transmission is working fine.
So, if the transmission is working fine you can leave it alone if you choose. If the transmission is not working right changing the fluid might fix it. If you want to change the fluid just because you think it is a good idea it is not a Bozo no-no.