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You're supposed to vary speeds for the first 600 miles.. When you accelerate you're heating up rings, then when you let go of the pedal, the slowing down lubricates them.
As for oil, the engine has NO idea what oil you're using. If it were that sophisticated, it would drive away Oil Ana.lysis companies. The OLM just compares information from what the car is designed to already know. Such as fuel/air mixture, how wreckless one drives, etc. Then it extrapolates that information resulting with the estimated oil life.
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