RE: Oil Changes versus Service Appointments/Kicker Sound System
As far as the oil change, most here and other forums have noted a change engine oil light around 2500 to 2700 miles. It is highly recommended that you get the initial change then. Make sure they reset the oil change light. You can do yourself it's really easy. There after 5000 mile oil changes with Mobil 1 should be fine, unless you get the light sooner.
The the Kicker system you can get some information at the Dodge web-site but I found all I needed in the manuals that came with the car. Yes, the large speaker in the trunk is your sub-woofer and it it really sweet.
Enjoy!