I want to know if the methods a vehicle decides when to turn on the oil change light have to do with the qualities of the motor oil used in the last oil change. I have heard that the vehicle's computer calculates when the oil change light turns on due to number of engine startups, average speed of trip, time before thermostat opens. Now all of these (are there more?) can not infer the quality of oil engine with a possible except to the time it takes for the thermostat opening which may be a slight way to indirectly infer the type of oil last used.
I ask this question because supposedly synthetic motor oil lasts longer than conventional and if that is true I might wait longer after the oil change light turns based on my knowledge of how many hard/highway miles I have put on my vehicle.
