Oil change takes 5-7/8 quarts -- so buy 6 quarts.
The engine oil spec on this vehicle is
peculiar, so I recommend you pay extra attention to what oil you use. The manual lists 0W30 as the recommended viscosity,
however it also states that engine oil
must meet MB229.5 specification. As far as I can tell, there is no 0W30 oil that meets MB229.5 available through normal retail channels in the United States.
The Infiniti manual does specify that 0W40 is acceptable... And that viscosity is easy to obtain with MB 229.5 certification. Coincidentally, Mercedes -- the company that actually designed and manufactured the engine -- recommends 0W40 for their applications.
For those reasons, I suggest Mobil 1 FS 0W40. Walmart carries it, as do most auto parts chains.
You do need a 27mm socket and extension to remove the filter cap.
The oil filter is a cartridge-type. I recommend MANN filters, part number HU7116Z.
You should always use a new crush washer, part number 11026HG00H.
Torque the drain plug to 30 ft-lbs.
Drain plug is basically exactly where you would expect it to be... rear of oil pan: