1) Read your vehicle’s Owner’s Manual and you should find the Manufacturer’s recommended oil change interval. Or try to go to the manufacturer’s website and search for the information.
2) The State of California has a website at which you can determine the recommended miles to put on your vehicle before changing oil.
Click to go to the California website: CheckYourNumber.org
It seems that most windshield Stickers only tell you the mileage at which you should get your next oil change.
What’s missing is at what mileage was it last changed, so that you can tell how many miles have been driven on the current oil.
Using this system, you can keep up with all the mileage numbers.