Wow. An interesting array of responses as I read this tonight.
I own two 2002 330Ci convertibles, one up North and one here in Naples, the latter just recently acquired on BringaRrailer.com. While the selling dealer did a major refurbishment of the cooling system, I ran into a couple vacuum line leak issues after getting the car home. I just started working with a small, non-descript shop here in Naples, Import Performance Tuning on Kirkwood Ave in Naples. There are bigger shops around, but these guys impress me with their knowledge and love of BMWs, particularly the e46. As a fellow officionado, I’d love to connect with you here in Naples, but not sure how that is done. I hope this is helpful to you.
As noted, the oil pan gasket is a relatively inexpensive item to source, but installation is no mean feat.