I changed the CVT fluid in my 2013 Maxima, and did the external CVT filter as well. The Nissan filter assembly is # 31726 - 1XEOA. These photos show the original CVT filter that is plumbed to the radiator cooler, it is accessed by removal of the plastic splash panel at the drivers front wheel well. The RE&RE for this filter takes about 25 minutes after you remove the drivers front wheel.
Car ran fine before, should be fine going forward. This was the 2nd change of fluid from new, I run the Pennzoil Platinum CVT-2 oil because that's what I found was economical and shared the same manufacture as the Nissan NS2 oil. This original filter had 107,325 kilometers and 7 years use. FWIW, Nissan does not show any required maintenance for this filter. Whatever.
Thanks for taking the time to do this and share it. That's quite the assembly. Doesn't look too crazy expensive either. A quick google showed prices anywhere from $30-50. The filters are all over the place on these Jatco units it seems. Some are mounted behind the cylindrical shaped fluid cooler/heater assemblies, some are under their own housing on the transmission case as in my 2019 Pathfinder's CVT and some are complete external assemblies like yours. I guess what ever the rock catcher filter behind the pan doesn't grab, these will. I don't think I've ever seen a really clogged looking one based on what I've seen people post.
Thank you. Yes, I am aware of the tranny pan screen type of filter. Do you know where the other one is located?
I haven't actually done it myself, but I was looking into buying an 2018 Altima so I was reading about servicing the transmission since I will do so regularly as sort of a preventive measure if I do end up buying one. At about 5:30 into this video he shows you where it is, it appears to be towards the front of the transmission.