My oil changes are covered until the end of the warranty, but I will look at synthetic oil at that time. One question I would have though, would the oil change indicator in the EVIC notice the difference? I just turned 30,000 km's (over 13,000 of those on a U.S and Canada trip this summer) and have had five oil (counting one in Reno Nevada midway into our trip) changes already, but to be honest I'm a little nervous about going 10,000 miles between changes. I've always been meticulous when it comes to the fluids and because of that (I think) over the years, I've never had any major problems. Old habits are hard to break. Of course it could be that all my vehciles have been Chrylser products except for one Ford.