I bought my Element used, and the original owner used Mobil 1. I drive about 7k miles/year in 95% city driving. In my old Honda Accord, I had my oil changed every 3,500 miles which added up to every 6 months. During the duration of my ownership of the Accord, I took it in to my Honda guy and never questioned what oil he put in. After looking at receipts when I sold it, I saw he used Mobil 1. My Honda guy has since retired and my new Honda guy uses Valvoline SynPower. I figured I would try to stick with the Mobil 1 since the last owner used it and my last car never had problems. Anyway, how often should I have my oil changed with Mobil 1 when I drive 7k/year 95% city driving?