Thanks X2, Musikman. I bought some Mobil 1 synthetic 75W-140 for the rear ('06 XOR), and will be draining / refilling soon. I was pretty sure that I had read the owners manual correctly, but I saw another post that mistakenly called for 75W-90. Not wanting to make a mistake, I googled "M226 rear end", and this post came up.

As for the Permatex on the drain and fill plugs, I used teflon tape on my '01 X, and didn't have an issue. Somewhere, I read that Permatex on the threads (of the fill plug) could have a potential to fall inside when removing the plug. What are your thoughts?