It should say in your manual but I think you should use 5w-30 for an 01...6-6 1/2 quarts...I know one of the years they switched and said you need 5w-20 so I'd check your manual...
I use Castrol GTX and have never had any problems using it...
Depending on your mileage you can go with a 5w-20 or 5w-30. It is very important to use non-synthetic during break-in ( even up to 7-8,000 miles )
After that a synthetic of the same weight will work just fine. The reason is for everything to seat properly.