Here's an answer you would get if you read the manual (not being mean at all)..

The system is equipped with a FSS, forgot what it stands for (you can google), it basically monitors air, dust, how you drive, miles, days, etc, to determine when you need an oil change. It will let you know when you need it changed providing you reset it every time you have maitanence done...

The 7,000 interval is correct, the car uses FULLY SYNTHETIC Mobil 1 0w-40 oil..

It also uses 8.5 quarts of it. Fairly expensive..you're looking at about a $75 DIY oil change.

So, change it every 3,000 miles if you want