I'm ready to do the first rear diff fluid change on my 2016 MDX. I watched a bunch of videos on it and it looked reasonably easy. So I dropped the spare and prepared to do the job but for the life of me, I can't identify the drain plug. I am looking for something that looks like the fill plug which I have identified. A plug which will accept a 3/8" extension. One other thing, can someone confirm that the correct fluid is Acura All Wheel Drive Fluid(DPSF)? That is what the dealer parts guy recommended. Thanks in advance.