I just bought a new 2011 patriot - latitude 2.4L 4x4 and when I start my engine it sounds weird for the first few minutes. It is louder like i can hear the pistons going up and down or something. Once it warms up a bit though it sounds fine like any other engine being on. Has anyone else...

Hello I have owned my 2011 pat lat 4x4 5m FD1 for 5 mo now and have 9000 mi. I drive back in forth from CA to AZ. I currently avg 28-30 hwy and 24-26 city. I have had no problems yet except a buzzing from my driver side air vent next to the door. I have taken it off road (light) and its ok. I...