Pull out the stick and it will tell you on the stick how to check it properly.Wrong. The 540i has a sealed transmission. To check or change fluid you must raise car keeping level, remove Allen head plug.Fluid should be level at top of plug hole.
BMW Dealerships...
You have to lift the car level and remove Allen wrench plug the fluid should be even with the hole
The power steering fluid reservoir is located next to the oil filter on a 1999 BMW 540i. The reservoir will have ATF written on it.
The battery on the E39 540i is in the boot on the r/h/s. Remove the plastic bin, and you will see it. BMW 540i owner, Chichester.
disconnect the negative battery terminal for 10 minutes.
18.5 to 19.5 gallons for a 2001-2003 BMW 540i
Underneath drivers side ac cabin air filter remove filter and remove the housing it's right under there
214000miles
e39 540
The 0-60 time for a '99 540i should be around 5.8-6 seconds. This all depends on your driving, of course.
dealer, parts stores can order it, or you can check on line for the part. do a search for BMW parts serpentine belt. hope it helps. duboff
Its in the trunk where the battery is.