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I have a Y2K coupe and if you don't reset the OLM properly it will read 82%. I have no clue why, but it just does.
The answer is to turn the key on - engine off. Go to the oil life % screen, then press and hold the "Reset" button until it goes blank.
It will then read 100%.
From: NorCAL Live your passion--why wait, you ain't getting any younger
I read somewhere that the Oil Life indicator can also be reset by putting the key into the ON position without starting the engine, and mashing the accelerator pedal a couple/three times.