Originally Posted by Singletrack
There IS an oil condition sensor. There is a pdf on this site that explains how it works. Maybe it isn't as advanced as you would like, but it is attempting to measure oil quality on some level.
My car has never gone the full 15k before it told me to change it - because I drive it hard...most days.
If this were true, wouldn't the service indicator reset itself when you put fresh oil in?
Likewise, if you had the car serviced with low quality 10w30 oil (in theory
) would the service indicator call for an early oil change?