Originally Posted by JAJ
Maybe it will sound an alarm if the oil has too much acid or something, but if it doesn't then mileage or fuel consumed prevails.
Or, maybe the "condition" it measures is "present" (read: good) or "absent" (read: not so good).
I've read on the various Bosch and other automotive OEM's about oil sensors that can distinguish condition, but they seemed pretty "prototype-ish". Wouldn't they have problems giving a valid report if the owner put a different oil in the crankcase, or if Castrol reformulated TWS for that matter?
Here is a descriiption from BMW.