I have an old Yanmar tractor and the oil pan is stripped. It does not leak but you can not tighten it. Just a little snug.
I feel it will end up leaking. I can remove the pan and try to go one size up on a tap with new drain plug. I happen across the ecoplug.
Any one has used one of these? ecoplugsystem.com/ 10mm-14mm-magnetic-oil-drain-plug/