If you drop the pan, get it heilcoiled at a machine shop. Shouldn't be a problem. You could even do it under the car yourself.

I wouldn't screw around with that oversized plug. It will be an issue next oil change and every change after that.

rjp

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03 540I (GAK!!)
81 280E (W123)
70 LeMans Sport with pissed off Poncho 462"
1989 Silverado Step Side (under the knife- complete restomod)