Per Honda owner's guide.....
Between 6,000 miles (9,600 km) and 7,500 miles (12,000 km) indicator will light for two seconds when you first turn the ignition switch to ON (II), and then flash for ten seconds.
If you exceed 7,500 miles (12,000km) without having the scheduled maintenance performed, this indicator will remain on as a constant reminder.
Maintenance Schedule: Replace engine oil (5w20) every 7,500 miles (12,000 km) or 1 year. If you use synthetic, the oil change interval is still 7,500 mi.
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1999 Olds GLS