Recently we received a coupon for a free oil change from our local Land Rover dealership, and we set up an appointment to get it done. I was shocked to see the coupon because we have never done anything at any Land Rover dealership, and for $120 for an oil change I probably never will. Once they were done they put the normal reminder sticker on our windshield, but it says we are not due for another oil change for 7,000 miles. They did not use synthetic oil and even if they did I've always been told the furthest to go on synthetic oil is 5,000 miles. So could this be right? I was always taught growing up that oil changes were the most important thing to get done, and you did it every 3,000 miles. Have I been wrong all this time?