From Nissan's own website:
Schedule Options :
SCHEDULE 1 (more severe operating conditions), every 3,750 miles or 3 months, whichever comes first.
Use Schedule 1 if you primarily operate your vehicle under any of these conditions:
•Repeated short trips of less than 5 miles in normal temperatures or less than 10 miles in freezing temperatures
•Stop-and-go traffic in hot weather or low-speed driving for long distances
•Driving in dusty conditions or on rough, muddy, or salt-spread roads
•Towing a trailer, or using a camper or car-top carrier
SCHEDULE 2 (less severe operating conditions), every 7,500 miles or 6 months, whichever comes first
Schedule 2 features 7,500-mile service intervals; with Schedule 2 fewer maintenance items are regularly checked or replaced than Schedule 1.
Generally, Schedule 2 applies only to highway driving in temperate conditions. Use Schedule 2 only if you primarily operate your vehicle under conditions other than those listed in Schedule 1.
So...if you typically drive in the conditions listed for Schedule 1, then, yes, you do need to do oil changes every 3,750 miles. This type of driving is typical for of the majority of the drivers on the road, IMHO.
If you are primarily a highway driver who lives in areas without temperature extremes, you can push the interval to every 7,500 miles.
That being said, my own personal philosophy on this topic is that I never go past 4k miles (or 4 months) without an oil change. As one of the other veterans of this board (screen name: the same mountainbike) says, "Oil is relatively cheap, and engines are very expensive". If you hang around this board for awhile, you will see that the majority of severe engine problems are the result of going too long between oil changes and/or failure to check (and correct) the oil level regularly.
Truthfully, I doubt if the Nissan website is the only place listing this info, and I strongly suspect that the OP can find essentially the same info in his Owner's Manual.
(Hint: You REALLY need to open the glove compartment, take out all of the booklets sitting in there, and read them all if you want to be able to operate your vehicle reliably, safely, and economically for the long term.)