Thats good to know. Thank you. So how does the ECU know the oil is OK? does it have some sort of sensor in the sump? or is it just the length of time since the last oil change was done?
No sensor as far as I know. The ECU does a calculation based on mileage, type of driving (speed, journey time), number of DPF regenerations (and attempted regenerations) and maybe other parameters. It uses this to come up with a figure.
Robert G8RPI.