I am confused about the transmission fluid change that Nissan requires on my 2010GTR. The manual clearly says that the transmission fluid and diff fluid change is PERFORMED BASED ON THE MILEAGE ONLY(pg28 2010 Manual)but my dealer says the fluid must be changed at 18mos.I will have approx 6000 miles on my gtr at the 18 month mark no where near the 18,000 miles that the manual indicates for the transmission fluid change as per mileage limit. I as well as others are looking for a common answer here. Any help from those who know???