I've looked all over, including on Amazon, Oreilly's, AutoZone, RockAuto, and JCWhitney... And I cannot confirm which size of drain plug is the correct one. They say either M14 x 1.50 or M12 x 1.75. I have a feeling that for whatever reason some of these sites are incorrectly assuming that the Edge has a 2.0L 4cyl engine when in fact it's a 3.5L V6. I think the correct size is M12 x 1.75, but I'm asking here in case any of you know for sure.