There are actually two separate maintenance indicators.
One between the gauges which is controlled by the Menu and Enter on the right of the cluster.
The one in the middle is controlled through the vehicle computer. They are two separate devices and have nothing to do with one another
http://www.infinitiusa.com/pdf/techpubs ... i-EX35.pdf
page 98 of this text explains the indicators and their possibilities.
Are you changing the oil or just resetting the indicators?
The oil change interval is supposed to be 3750 miles.