Technically, you are replacing the lower oil pan. Just to be clear

The oil level sensor has a weird seal. If you disturb it, I would replace that seal as well.

The Bentley manual gives three torque specs. I recall realizing I had only one size fastener. Guess they changed during production, so you have to measure and read the markings on the head.
M6 8.8 grade 7 ft-lbs
M6 10.9 grade 9 ft-lbs
M8 8.8 grade 16 ft-lbs

No spec given for the nuts on the oil level sensor.

The Bentley manual also says to use new bolts as they are coated with sealer. I

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles