How to reset change oil guage 2005 cobalt

I would imagine the recommended oil is 5w-30. 20w-50 is too thick.

to reset the light with the doors closed key on press the gas down to the floor 3 times then the light should flash then its reset

first check the throttle plate for carbon build up the look for the knock sensor harness rubbing onto the fan shroud

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Hello. What that means is that only 16% of your car's oil life remains before you should get an oil change. This is a better method of knowing when to change the oil than the old fashioned rule of thumb of merely changing the oil every 3,000 miles.
When you do have the oil changes, the counter can be reset back to 100%. If you have your oil changed at a garage, they will reset the counter for you. otherwise look in the owner manual for the instructions on how to reset the counter. regards, Joe
ps = kindly rate my answer as helpful. thanks.

turn the key on
press the gas pedal to the floor 3 times with in 3 seconds
the change oil light will flash then go out

oil change

If you can see and get to all of the bolts which hold the oil pan to the bottom of the engine and if it appears obvious that the oil pan can be removed without being blocked by anything else, then you don't have to remove the engine. Come to think of it, I don't think that I have ever seen a car where you had to remove the engine in order to remove the oil pan.

Sounds like a faulty sending unit... or a loose/ damaged wire.
The gas doesnt touch the unit, so the gas is not the problem... only coincedence.

to reset your oil life turn your car to the on position dont start it and tap the gas like 3 or 4 time then shut it off the start it and when you do all this you cant be on the brake or the clutch if you have one