Oil Changes on a 2009 Chevy Malibu

I agree.

The car (or the software) monitors all available parameters of driving and determines how much life the oil has left. Only question is how conservative the manufacturer has been in setting the limit. Like geeaea says, if you are not comfortable with the monitor, change the oil when you have 10, 15, or 20% of life left. But don’t change the oil prematurely according to odometer reading. It may only cost 20-30 dollars, but the impact to the environment is not cheap.