Quote:
Originally Posted by piotrek
So software reset after oil change is not necessary, only recommended, good news! Filling and warning levels indeed seem to differ among model years.
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The oil level is reported to the CEM by the oil level sensor in real time. In the "wisdom" of the system designers, the CEM only presents the driver with information that has been averaged over a longer time. Therefore the customer might drive away from the dealer with a low oil level warning displayed because the averaged reading includes oil levels reported whilst the sump was being emptied and refilled, and complain accordingly.
So the dealer resets the system to prevent that and the averaging as presented to the driver continues from a new baseline. Without the reset, the oil status presented to the driver will normalise after a while. So as long as you are certain that the oil level is actually OK (by knowing how much oil you have put into the sump and reading the level directly from the level sensor in real time during/after refilling, e.g. with Torque or suitable diagnostic equipment) you can ignore the warning.
Obviously dealers don't want to hand cars back to customers with warning or error messages displayed, so they reset the system first.