Thanks all for helpful info re my leaky oil drain plug!
It was *I* who changed the oil/filter - so that makes me the culprit!
I reused the existing washer, & tomorrow will examine to determine
if I might have left the washer off--etc.
Major egg on face!

If it turns out threads are stripped, now I know what to do.
(I suspect it was just my error with the washer...)
I intend buying a dozen washers now, & replacing every oil change.
Thanks again to all you wonderful advisors!
Cheers,
Phaedra