Change oil light stays on

Using the black push button/rod, you know the one where you can switch to see trip A trip B etc?
keep pushing it til you get to the check engine part then it will cycle through several things. when you find the right place it will read "if new oil hold reset" at this point just hold reset. That is the black push button/rod.

If this don't work, try it again, sometimes it may miss...

How to Reset the Change Engine Oil Message
The Aztek uses the GM Oil Life System to calculate when to change your engine oil and filter based on vehicle use. It is widely thought to determine oil life by counting engine revolutions.
There is much debate about the merits of such a system as a basis for determining when to change engine oil, the system should be reset after each oil change to ensure that the CHANGE ENGINE OIL message does not appear inappropriately.
There are two procedures for resetting the system, one for Aztek's with a DIC (Driver Information Center) and one for Aztek's without a DIC.
PROCEDURE 1: Aztek's with a DIC
1. Turn the ignition to ON with the engine off.
2. Press the MODE button until the DIC reads "OIL LIFE LEFT/HOLD SET TO RESET"
3. Press and hold the SET button until 100% is displayed.
You will hear three chimes and the CHANGE ENGINE OIL message (if illuminated) will go off. Repeat this procedure if the CHANGE ENGINE OIL message comes back on.
PROCEDURE 2: Aztek's without a DIC
1. Turn the ignition to ON with the engine off.
2. Fully push and release the accelerator pedal slowly three times within five seconds.
3. Turn the key to OFF.
If the CHANGE ENGINE OIL message continues to be illuminated, repeat the procedure.