It, the ECU, monitors things like how many times it was started. Started when cold/hot. Driven short distance/time. How hot it got, pulling trailer etc. Easy driving, hard driving etc. It takes all info and determines when to set change oil light.
2016 Challenger R/T Hemi 6-speed.
2012 Equinox 2.4...Wife's Ride
2014 RAM 3.6/8 speed/3.55 gears........Gone.
"Life's hard, it's harder if your stupid."
How would you know?