The recommended oil type for a 2000 Chevrolet Impala is 10 W 30. The car uses automatic transmission fluid that can be purchased at any auto parts store.
5w30
Recommended, yes. Required, no.
The 2003 Impala uses between 4.5 and 4.75 quarts of oil during an oil change. Use the dipstick after getting the oil level close to add more as needed to fill.
10W30
SAE 5w20
5w-30 regular oil or synthetic, whatever you prefer.
See *What Kind of Oil to Use* on page 314 of your "Owner's Manual".....
SAE 5w20 any major brand.
5w-30 is reccomended for the 3.5l v6.
FIND A SHOP THAT USES A TRANSMISSION FLUSH MACHINE.
Use Castrol GTX.