Just finished swapping out 4qts of NS-3 CVT fluid from my 2016 Nissan Quest @ 33K miles. What drained out was pretty much black, but no particles or metallic sheen to it. This task is easier than an engine oil change on this van. There's an easily accessible drain plug, a level check plug and a "fluid charging pipe" (AKA- disptick tube) up top. Same setup on all late model Pathfinders and Murranos AFAIK. It took me just a few minutes to complete. There's enough room underneath that you don't need ramps, etc. I drained/filled it cold. I pulled the level check plug first to see how full it was and was surprised at the amount that came out cold. Maybe close to a 1/2qt? The level check plug has an O-ring seal, where the drain plug has a copper crush washer. I didn't replace either given they are basically new. This fluid is THIN. Like brake fluid thin. It also has pretty much no odor, which is a welcome change. I was bracing for a Maxlife-like ATF stink (yuck). Nothing. The new stuff is windshield washer fluid blue. We'll see how it goes and I'll probably get 2 more quarts and do another drain/fill sometime in the not so distant future.
