Chevrolet 2003 Corvette Owner's Manual page 162

Average Speed
Press the TRIP button until the average speed is
displayed, such as:
4
AVERAGE SPEED 62 MPH or
4
AVERAGE SPEED 100 km/h
Press reset in this mode to start calculating the average
speed. Press and hold RESET to clear.
Engine Oil Life
Press the TRIP button until the engine oil life is
displayed, such as OIL LIFE REMAIN 89%.
This
is
an estimate of the engine oil's remaining useful
life. It will show 188% when the system is reset after
an oil change. It will alert you to change your oil
on a schedule consistent with your driving conditions.
When the remaining oil life is low, the system will alert
you with the message CHANGE OIL SOON.
When the oil life is down to zero, you will receive the
message CHANGE OIL NOW.
Remember, you must reset the OIL LIFE yourself after
each oil change. It will not reset itself. Also, be
careful not to reset the OIL LIFE accidentally at any
time other than when the oil has just been changed. It
can't be reset accurately until the next oil change.
To reset the system, see "How to Reset the Change Oil
Soon Message" under Engine Oil on page 5-13.
Also, see Engine Oil on page 5-13 and Scheduled
Maintenance on page 6-4.
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