Originally Posted by GregW / Oregon
The CBS system supposedly monitors oil quality as one parameter. Why wouldn't an early change extend the normal interval? Or, does the oil "condition" have to get pretty bad (e.g. lots of short trips) to change the default 25,000 km interval?
Despite all the rhetoric, I think the oil CBS system still only monitors fuel consumption between oil changes, just like it always has.
I recently left Vancouver showing 4200km to the next service. I drove to Portland and back (1000km total) and did 200km at PIR. My 1200km trip translated into an 800km drop to 3400km to the next service. Low fuel consumption while sitting on I5 in cruise control is my explanation for why the CBS recorded 400km less than the actual trip distance.