How do I reset the Engine Oil Life System after an oil change?
Display the OIL LIFE REMAINING on the DIC, then press and hold the SET/RESET button on the DIC for more than five seconds until the oil life changes to 100%. The oil life system should be reset to 100% only following an oil change. This system calculates engine oil life based on vehicle use and displays a DIC message when it is necessary to change the engine oil and filter. (Page 26)
From the official Chevrolet 2010 Impala manual, page 26
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