I have a monte carlo 04 and i'm trying to turn off the change engine oil light

Sounds like you need to replace thermostat assy and add new antifreeze and as far as your oil gauge, replace the "oil pressure sending unit". That should solve your problem

Reset oil change light. some GM cars and trucks switch on ignition, do not start engine press gas peddle to the floor then release and switch ignition off. This procedure is in the owners manual.

I changed oil now engine light on an tiers light

The "Oil Change Reminder Light" has to be reset.

To reset the oil change reminder light with the accelerator pedal, turn the ignition switch to the ON position. Do not start engine. After turning the ignition ON, depress the accelerator pedal fully to the floor and let it up again 3 times within 5 seconds. The oil change reminder light should flash a few times to let you know that it is resetting. If it does not flash, turn the switch OFF and repeat the procedure. After it flashes, turn the ignition switch OFF. Then start the engine. The light should come on for a bulb check then go out and stay out.

check the oil level, then the oil filter and change the oil. if light is still on replace the oil pump. also check the old engine oil for small pieces of metal in case the engine spun a bearing if you see and dont start the engine for risk of further damage.

TURN KEY ON, DO NOT START! PUMP GAS PEDAL TO THE FLOOR 3 TIMES WITHIN 5 SECONDS, THEN WAIT AND WATCH THE LIGHT IT WILL FLASH THEN IT SHOULD GO OUT. REPEAT IF IT DOES NOT WORK THE FIRST TIME. MOTOR62500!

posably
but the best bet is AAMCO for a free look see

the light was tripped by the low oil your problem was truly minor

this is normal roller rocker noise, it will not cause any concerns, (from a GM TSB)

I have a 04 MC and the only way i know of turning it off is through the radio.. i havent been able to turn mine off since i got a new cd player though. And i dont quite remember how to do it on the stock radio.. but dont go buy anything new nothing is wrong!