I work for a competitor of Amsoil and want to know what Amsoil recommends in changing the oil in vehicles? I know there's been some major improvements overall in the motor oil market and some guidelines for oil changes are outdated. The state of California has aggressively campaigned against changing oil every 3,000 miles, calling it wasteful and Jiffy Lube says to change your motor oil when the vehicle manual tells you to so how and when does the Amsoil user change their oil if you don't mind sharing the infromation with me.