IMO it isn't worth the battle with Nissan if someone happens to your car. $40-50 every three months isn't a huge setback for most people. Can you extend it to 4 or 5? Sure but if something happens to your engine there is a descent chance Nissan will want records of your oil changes to warranty and that might come up.
Warranty aside, my Chevy Trailblazer specifically said in the manual to change the oil either when the oil life monitor said to, or every year, whichever comes first. It did hold 7 quarts vs our 5 though.
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