So people mostly right. Change it when the car says change it.
However, modern vehicles are full of sensors and do use these to estimate actual oil life remaining. An engineering team tested the heck out of this for you, torturing engines and oils. Milage is a big component but so are other parameters like engine temperature, power level, idle time, etc. Lots of short trips, yup the computer is going to call for oil changes sooner. Hours of commuting through city traffic vs smooth highway driving, yup the computer will call for an oil change with less city miles.
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