OK, as promised, I am posting my experience flushing my tanny.
The car is X5 4.4i 2001 with 123,535 miles on it and this
service has never been done in the past.
Lifeguard5 Fluid is for 5-speed ZF transmission E53 and may be used on other years/model as well.

The tools you need:
- T27 Torx bit
- 8mm Hex drive (for the filler and drain plugs)
- 10mm socket
- Torque wrench (lower range from arounf 6lbft to 50lbft)
- Oil manual pump to put the fresh ATF into the pan (see one of the pictures)
- Rubbermaid small step stool.
- Oil catch pan (I use 10 quart version)
- Plenty of rags or kitty liter, trust me you’ll have plenty Pentosin on your garage floor
- I use brake cleaner spray to clean the pans and hands

The parts
-Trans filter
- trans pan gasket+all 22 hex bolts have been replaced
- Lifeguard5=Esso LT71141 (I ordered 6 quarts) for $87.

Job has been successfully done! car still driving smooth as usual.

Attached Images