Sounds like engine is at higher RPM than indicated

Asked by GuruNRZJT Nov 06, 2019 at 04:07 PM about the 2012 Chevrolet Silverado 1500

Question type: Maintenance & Repair

I recently drove my 2012 Silverado (just over 92k
miles) for 3 days/1700 miles. At some point in the
first half of the trip the truck's self diagnostic thing
had said ~25% oil life remaining. The night before
the 3rd day, temps dropped to -10F. I didn't really
notice anything until I got back and was driving at
slower speeds, but the engine sounded like it was
in a lower gear/at higher RPM while the
tachometer was indicating normal RPM. About the
same time, the 'service engine oil soon'
annunciation appeared with the check engine light,
and the self diagnostic said 5% oil life remaining.

I tried switching to 4WD and back to 2WD, went
between manumatic to change gears and back to
automatic, no change. Took it to the dealership
and had the oil changed and tires rotated but it's
still making the noise. It becomes noticeable from
around 25mph and gets a little louder as speed
increases.

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