Quote:
Originally Posted by pty370z
Oil Drain Plug is M12xP1.25 so I'm guessing you'll need a size 12. 
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M12 is the bolt shank diameter (i.e. 12 milimeters). Socket sizes are measured "across the flats" so would be larger than 12. Probably closer to 18 milimeter socket size.
Edit: Looking at my machinery's hand book, looks like 18 milimeter socket.