When to prime the oil circuit

[Arith2]

I do vac out the oil in the oil filter housing when going an oil change. I also dump about a 1/2 liter in, install the oil filter and then dump another 1/2 liter on top of the oil filter.

Is it necessary? Probably not but I makes me feel better.
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I haven't seen a BMW without copper dust in the oil filter housing yet. I've done a lot of BMW oil changes and have seen knocking Porsches with less copper in the oil.