What I'm seeing is that the many oil-change outfits aren't careful and strip the oil drain plug. I am (as we speak) figuring out how to fix the plug in my daughter's Dodge Intrepid (aluminum pan, wouldn't you know...).
The self-tapping oil drain plug (NAPA) is one solution but while it may work I don't think it will stand up over time and continued abuse by the very people who over-torqued it in the first place; and, my daughter is unlikely to ever change her own!
Plan 'B' looks like this:
http://www.denlorstools.com/home/dt1_1331623636346/page_41032
NOTE: this is for her Dodge. I don't know the thread size/pitch off the top of my head.
It's a more serious solution. Their description reads "Time-Sert oil drain plug repair kit for aluminum pans with metric 14x1.5 size plugs. This kit is a must for any repair shops that perform oil changes. One aluminum drain plug thread repair can save hundreds of dollars! This kit not only restores the oil pan back to it's original 14x1.5 thread size... it makes it STRONGER! This kit part number 1415C is commonly used on Honda, Acura and Chrysler vehicles with aluminum pans that have metric 14 x 1.5mm drain plugs. Why replace an oil pan for around $500 when this repair can be done on the vehicle for a a fraction of the cost? Are aluminum threads stronger than the steel threads? Of course not, that's why TIME-SERT thread inserts are a better option than replacing an aluminum oil pan. This kit is frequently used on GM's, Ford, Chrysler products and Hondas - it can be used on any make with 14mm size drain plugs."
Looks robust and I've seen others who've used it recommend it for the same aluminum-abused-by-the-hurried problems we're facing.
Mark