I just got my first oil change, done at the dealer. I have about 3000 miles on my Caliber. I was going to use synthetic oil in my Caliber. But the service writer, who use to own one of the area premo engine shops, told me to wait till after 6000 mile to change to synthetic oil. He says the Caliber has chrome rings which will not seat properly if you don't give them at least 6000 mile with standard oil.