Need a little expertise here guys. I just purchased a 2011 caravan with the 3.6 and 26,000 miles on it. I was looking over the manual and it calls for an oil change every 8,000 mi or every 6 months. This just seems a little extreme for me. Is this even with conventional oil? I live in Minnesota where the winters can be pretty harsh! Im used to the typical every 3,000 miles so every 8,000 was pretty surprising to me. Can I please get some opinions on this? Is every 8,000 just fine or should I do the changes more frequently? Thanks a lot for your input guys!