Since this topic comes up every few months on here, I usually suggest the easy repair kit that they make for this purpose. It's a custom oil drain plug that's slightly larger and has self-tapping threads. Motormite and Dorman make them and I have posted the part number and info before.
I'd suggest that you search the forum for the part number, but I just did and I can't find anything. Why does the SBN search function rarely work for me. I'm sure that I posted a thread with motormite in it, but when I search for motormite (or dorman) I get nothing....
Here are some of them:
Oil Drain Plug/Part at PartsAmerica.com