Ha! I don't actually have a car at the moment, but I got crap from a co-worker who discovered I was not a regular oil changer. (To be fair, I have learned the hard way what happens when you take it to extremes, but really, I'm much better now.) Well, it turns out that every 3,000 miles is aggressive to the point of being wasteful. And now I have proof that taking it a bit longer (not forever, just longer) is good for both the car and the environment.