Yeah..do yourself a favor and avoid warranty entanglements with Nissan....I'm big on doing my own maintenance (engine oil changes, tire rotations, etc) but when it comes to transmissions and cooling systems, I let the dealership do it, with whatever products they recommend. This is my 3rd Nissan, and believe me, they will try to wiggle out of warranty work by any means possible...including voiding your transmission warranty because of non-recommended fluid use. I've heard mixed reviews on synthetic trans fluid, and as much as I believe in synth engine oil, I'll be sticking with Genuine Nissan products in my 06 Frontier's transmission.