I saw an ad in Car and Driver for the new Quaker State Q-power oil. It maximizes engine power and horsepower by reducing friction. I'm fixing to go in for an oil change, and I would like to use this oil...if it's ok to use in the RL. So does anyone know if it's ok, or should I stick with the Mobil oil that is shown on the engine? Also, haven't some of yall bought your own oil and taken it to the dealer instead of paying for it there?