Yes, you can technically get a maintenance program for as long as you want. You'll need to run the $$ to see if it makes sence. Also, some Infiniti dealerships will try and sell you a non-infiniti maintenance program without telling you. Ask for details.
Also, find out if it covers beyond oil changes. I got into a huge argument with a Dallas dealership becuase the salesman didn't know what he was selling. Telling me it covers everything, then coming back later saying it only covers oil changes.