With a normal car using regular oil, you would change it every 3000 miles or so. But this car uses synthetic oil with has a longer life. Normal changes are between 5000 and 7500 miles. The sensor on the Xfire will tell you when you are due for a change. But keep this in mind, don't use anything less then 93 octane. I've seen the inside of these engines. I used to put in a tank of 93, then maybe a few gallons of 89, then back and forth, but not anymore.