How do I reset the Engine Oil Life System after an oil change?
To reset the oil life system, first display the REMAINING OIL LIFE on the Driver Information Center (DIC). Then press and hold the V button on the DIC while the Oil Life display is active, and the oil life will change to 100%. The oil life system should only be reset to 100% following an oil change. (Page 26)
From the official Buick Enclave manual, page 26
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