The car requires a 5w-30 weight oil. This is required by the manufacturer no matter how many miles are on the vehicle. These recommendation should be stuck to because it is crucial to how the car runs.
5W 20
unleaded fuel
need more info, is a 2.4l,2.0l,1.8l,or 3.0 v6. different engines take different amounts of oil.
The thermistat could be bad, check to make sure the fan is kicking on.
5-30 weight SM rated oil.
10w30
5w30
10w30
5w30
5w30
Should only take four quarts but when changing the oil pour slowly and keep checking the dip stick.
need to know what engine size,v6 or four cyclinder,1.8,2.0,2.4,0r 3.0 ?