Because I do a lot of highway driving I'll probably change mine at around 6000/7000 miles. I think we all no the reason why the corner oil change outlet would like you to change every 3000 miles. Here is an excerpt from usatoday: So how often? Every 7,500 miles is enough for most cars, says Champion of Consumer Reports. "If you are running in hilly terrain, hot climates, fully loaded or a lot of stop and go, then probably you need to change the oil more often," he says. No one drives under so-called normal conditions, so every car's oil should be changed every 3,000 miles, according to Jiffy Lube, which has oil-change shops throughout the country. "Normal driving conditions are virtually non-existent," says Jiffy Lube spokesman Ray Scippa. "Jiffy Lube recommends 3,000 miles. Manufacturers recommend 7,500. The truth is probably somewhere in the middle," says Tony Molla, a spokesman for the National Institute for Automotive Service Excellence, which trains and certifies auto technicians. About every 5,000 miles and more often if you drive under severe conditions, says John Nielsen, director of AAA's repair network.