Is this a 3.0?

They are all likely if you have a confirmed oil leak. Inspect them all thoroughly. You can try spraying the suspected leak areas with brake cleaner to clean them up and then drive again to see if oil reappears.

Pan, filter adapter and VC are all probable on 3.0. Until you figure it out, be vigilant on your oil level. A leak plus standard consumption can combine to lose oil very quickly.

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2001 E53 3.0 5pd