I perform a drain/fill every 10k miles (only 4qts.)
On my initial drain/fill,milage was at 50k & fluid looked like black coffee,,,didn't smell burnt-but very dark.
I drained/filled,drove 5 miles & repeated 2 more times;until fluid was clean.
drain plug is 19mm hex @ rear of pan & fill plug (overfill is their term) is 5mm allen near front of trans.
I use the Valvoline Multi Vehicle ATF (meets all Nissan spec) & cost less than $20 per gallon at Wally-World.
I use a 1 gallon plastic pump-up style chemical sprayer to install in fill hole from bottom.
I did a dyi thread on this some time ago,,,i'll have to look it up-as it definitely makes a shifting difference each time i service it.
90k miles & rolling!
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