Your users manual will tell you what maintenance schedule you need to follow, there is normally a service handbook too that gets stamped at certain mileages that will tell you when your last service was done on the car, well thats what we have here in the UK, not sure on the US?
Ive already scrapped my DIC as mine was a nav unit and it wasn't the best, mines now a mechless unit that plugs into an ipod/iphone/android device for tunes movies and navigation!
oh and my steering wheels on the wrong side too!