transmission fluid

Rely on your owner's manual for fluid change intervals. Nissan has a manufacturer recommendation for when to change the fluid. I'm not sure what it is for your car, but I'd guess it's around 60,000 miles. 30,000 would be the minimum.

Check owner's manual for info.It is recommended that the transmission oil be change more frequently if using the car to towed heavy load,and traveling on dirt roads.