Based on things I read about BG products and their CVT fluid change (and CVT transmission warranty), I went to the nearest BG vendor, which happened to be a Mercedes-Benz dealership. The service advisor strongly recommended against using anything other than Nissan OEM CVT fluid in the Pathfinder. Remember, this was coming from someone who stood to profit from a potential sale of his product.... All I have suggested is there are aftermarket fluids available for this application if you choose not to use the OEM product. What ever that reason my be; No Nissan parts counter nearby, don't wan't to pay the cost of Nissan NS-3, etc.
I tried to buy the tool, wouldn't let me get an account. tried as guest, put everything in CC no etc, then got error 500, whatever that is.jman, all I do is drain them cold, engine off, vehicle on a reasonably level surface and refill with the same amount that drained out. With my 2019, it's a gallon. I have checked level from the level check bolt with the engine idling and the pan reading between 95-113degF with an infrared temperature gun. As long as you've got dribbling, you're good. No dribble, it's low. Gushing, she's too full. I know this method of checking temp is only ball-park, but it works and I'm not scared. LOL. I'm only at ~37K miles with my 2019 and don't plan to drop the pan or change the external filter for quite some time, if ever.
In terms of the charge pipe cap? Yeah, those are a total knuckle buster. You can buy a cap removal tool online. I wrestle mine off with a small flat blade screw driver. Here's the tool TECH-MATE