I don't believe it's cross threaded.
I think that somebody tightened the drain plug down to tight and took
the threads with the plug.
They are spinning around with the plug right now.
Find a metric / american conversion thread chart and tap the hole to the
next size bigger in american threads.
Put an new short bolt in the drain hole with a copper or nylon washer
for the seal.
You can try and chase what you have, but chances are the threads are
beyond repairing.
The MMO didn't do it.

RC

Subject: oil drain not snug. feels loose
well tonight after doing my MM OIL treatment, I put my drain bolt back
up and the damn thing seems soft and won't tighten feels loose and now I
got a drip, could a worn washer be the ticket? not allowing it to
tighten all the way??I'm going to drain the oil in a few days, might
have to get a new bolt also? hope my block isn't cross threaded?
Joe