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people , the car doesnt have an oil analysis machine in the pan... synthetic or regular, it doesnt change anything on the maintenance minder. It takes load of engine, at rpm, tps and fuel load with engine temp. It creates a slow moving average to what amounts to how hard or soft you drive your car over distances of time. I doubt it includes how many cold starts or any variables like that, but it should be fairly accurate to a point. But as I have seen from my excessive hiway miles, i wouldnt advise anyone to follow it. go by mileage.
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