You do you, but some red loctite on the oil pump nut will be ample protection against it loosening.

I would feel differently about a race car or another B30 running at very high revs for an extended period of time.

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'99 E39 528i 5-speed 130k
'06 325Cic auto 115k
'05 X5 3.0 auto 173k-SOLD
'03 530i - manual swapped - 430k miles-SOLD