Change it when it's dirty. Unless you're driving in a vacuum that'll be around 2500-4000 miles. Or 2 track days and some commuting.
More importantly, Don't put *-30wt oil in your cars, guys, and nothing that says SAE. M1 0W40. Royal Purple XPR 10w40. These oils have the protective additives your hi perf car needs and the right lubrication for the VQ system. SAE labeled oil is O2 sensor-safe corporate-approved generic stuff, the protective additives your car needs fouls their precious warrantied parts, and they've conspired against you. So, ignore the Nissan Corporate instructions like they ignored your need for a quality paint job, slave cylinder, fuel system, stereo, oil cooling, EXHAUST etc... Their Ester oil is super pure at the beginning which is great- for about 1K miles then it's like water because the Z34 oil pump shears the molecules. And the *-30wt stuff is for mom's Quest, not your Z.
Now that we're back on topic, please discuss.