Oil change how do you reset the computer after giving the 2008 cobalt a oil change?

Turn key to ON/RUN with engine off

Press the information and reset buttons on the Driver Information Center (DIC) at the same time to enter the personalize menu.

Press the information button to scroll through the available menu modes until the DIC display shows "OIL-LIFE RESET

Press and hold the reset button until the DIC display shows "ACKNOWLEDGED".
Turn the key to "LOCK/OFF".

Use mobile one synthetic 5w20

Yes, you should. While the oil life monitor is based on Hours run time, that seems like it was reset by mistake.

5W30. but make sure it meets GM spec. GM6094M I would use Mobil1 or other synthetic that meets that spec.

yes u do, the oil in the engine should be changed every 3-5,000 miles depending on what type of driving u do, stop and go is every 3,000, more highway, then every 5,000, the transmission must be serviced with a new fluid and filter every 60,000 miles

Yes it shouldn't be a problem but change the filter as well...........Hope this helps.

turn the key on the on postion and step on the gas pedal three times in a row.....

the oil filter is located at the upper side , front of the motor it s a cartridge filter no like regular filters, , you will see a plastic black cap under the intake manifold, will need a gid range

There are a couple of options for clearing the light depending on the features you have on your Cobalt.
If you have a DIC (driver information center) located in the bottom center of your instrument panel cluster or speedometer area, you should have a mode and set button to the left of the steering column. You can use the mode button to scroll through the options until you find the "oil life" percentage the us the set button, push and hold until you see the 100% displayed.

If you do not have the DIC, you can turn the ignition key to the "run" position ( do not start the car) and push the accelerator pedal to the floor and back 3 times in a row then turn the key off. That should clear the light for you.
Good luck and let me know.
Regards,

ask the dealer what kind of fluid they use or let them do it.wont cost much and maunal trans should be fine for at least 100000 km