5w20 weight.
See What Kind of Engine Oil to Use on page 6-14 of your "Owner's Manual", under Section 6: Service and Appearance care - Engine Oil.....
I know the 3.4L is 5w30, but I can't remember exactly when they switched the recommendation for the 3.8 from 10w30 to 5w30. Double check the oil cap and it will be on there if you have a 3.8L engine.
5w30
See *What Kind of Oil to Use* on page 314 of your "Owner's Manual".....
No you can not use gas engine oil in diesel engine oil because processing of diesel engine is different from gas engine oil. If you use this then it damage your vehicles.
Just use a 5w20 oil all the time. Use a thinner oil in winter if you live in a cold climate, but a 5w20 oil can be used in most all situations. In extreme cold, a thinner oil will travel up to the valve train way sooner, thus protecting your engine.
5 qts. with a new filter.
the engine oil to use is 5-w20
Use Castrol GTX.
yes you can
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.