My Porsche goes 15,000 miles between oil changes. It's also got 10 quarts of oil, so when it is time to change the oil, it costs a bit extra.
My mom's Mercedes has a light that pops on when the computer determines it's time to get the oil changed, depending on driving conditions and such. We got concerned that the light never came and changed it prematurely, but it was unnecessary, considering the way she drives.
