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Old 11-05-2011, 07:22 PM   #8
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There is no sensor its just an algorithm in the computer that tries to guess when the oil should be changed depending on ambient temps, engine temp, speed and other things like that. GM has used a similar system since the 1970's with no increase in oil related engine failures. However lately they have had timing chain issue with certain model year vehicles (chevy traverse is one) due to the computer letting the cars go too long before triggering a oil change light. They were issued a TSB to recalibrate the computer to disalllow this.
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