98 Lumina Change oil soon light

I have a 98 chevy Lumina 3.1 v6 When i start the car my change oil soon light is on But after about 30-40 seconds it turns off everytime, My oil change is not due for another 3k miles can anyone tell me why my light turns on?

Was it reset at last oil change?

dont know i just bought it off a guy last saturday and took it to firestone on sunday they did a complete check nothing wrong also had it emmisions checked so they read the obdII for codes no codes

I would read the owner's manual for valuable info to start with, when changing the oil, the oil life monitor is reset by turning the ign on, do not start the engine, step on the gas pedal 3x to the floor in 5 seconds.

This is very helpful to me as well! Thank you for that tip, as my "COS" light has been driving me nuts too!

I was curious about the interval when it comes back on, i thought it was 7000 miles (so, not so much as a reminder to change the oil, but a warning to change the oil)

however, alldata says the pcm determines when the light comes on by mileage AND driving habits.