For normal climates, use 10W-30 oil.
I work at Chevy dealership and we put 5 quarts of motor oil on 3.8L engine... In fact i have 2002 Grand Prix GT.
5 quarts
5w20
Do you mean an oil drain plug? If so, then yes.
depends where u live but mostly use 5w20 and what ever flavor u want. higher mileage 5w30 or 40
on the passenger side of engine by the wheel well
5w20 as can be seen on the oil cap
5w20
5w20
5w20
SAE 5w20
5W20