Troll, I don't know,,, I think it's just a glorified timer. There are OLM that optically analyse the oil. I have read reports of milky oil being drained from Volts in cold climates. The Volt will run its engine to only assist with cabin heat, and then it does not get up to 180-190°F typical range. It make the engine act like a gas burning stove. The oil never gets hot enough to burn off the moisture. I changed my oil at 2500 Gas Miles. ( old school ) It was not pretty and I wish I had done it earlier. I'm afraid some Volt engines have a hard life by never getting warmed up all the way. Only time will tell.