Oil change interval
I am used to changing my oil on all of my vehicles at about 5 - 6000 km intervals, never more. When I went to make an apt for an oil change on my 14 Grand Cherokee with my dealer ( at about 5500 km since last oil change) dealer advised me I could wait until close to a year or just less than 10,000 km. I found that extremely strange. Checked the manual and service guide and he was right. Even the vehicle information on the dash says I am only 50% to the next oil change. I asked the dealer what kind of oil they use and it's just 5W30, not synthetic! I find this strange and confusing! Comments?