How does the GM Oil Life System (OLS) work?
Vehicle maintenance intervals of three months or 3,000 miles no longer apply to vehicles equipped with this system.Instead of an actual oil-condition sensor, the GM Oil Life System relies on a computer-based software algorithm that continuously monitors engine-operating conditions and driver use to determine when an oil change is necessary.GM has calibrated the system for a variety of vehicles based on millions of test miles over a period of years.The system is now installed on more than 20 million GM vehicles.
