Daimler discovered that oil degradation is correlated directly with its ability to conduct electric current. Therefore, Daimler has fitted V-6 and V-8 engines with a digital oil quality dielectric sensor, that is mounted above the oil pan along with an analog oil level sensor. This sensor measures changes in capacitance, which effectively is a proxy for the amount and type of contaminants and oil degradation products present in the oil. An increase in dielectric constant (less resistance to electrical flow) indicates oil contamination and degradation.
Daimler-Benz (Mercedes-Benz) has been incorporating the sensor into its vehicles since 1998.
Some Cadillacs and other high end cars have this as a resistance tool as well on board in the oil systems to monitor.
Our cars have an algorithm that is calculated based on miles, gallons of fuel, temperatures and sustained idle.
The only real way to find out what is going on is to do an oil analysis. This sampling detects all the potential problem areas before they become catastrophic!
Our customers go at least 10k miles on their oils or 2 years. Some as high as 18k miles on one change.
Even 2000 miles is too soon on dealership oil.
By the way, "synthetic" is not a characteristic but a function. There are very cheap quality synthetics that companies use. Ever since the Mobil vs. Castrol lawsuit, this word has become fuzzy and blurry!
Try QuantumBlue once you get rid of the free oil changes and see what a real designed oil feels like in the car!:beerchug:
BND Automotive LLC:driving: