1999 Pontiac Grand Prix Owner's Manual - Page 273
1999 Pontiac Grand Prix Manual
Page 273 highlights
yellowblue As shown in the chart, if you have the 3100 V6 engine, SAE 5W-30 is best for your vehicle. However, you can use SAE 10W-30 if it's going to be 0_F (-18_C) or above. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W-50. 3800 or 3800 Supercharged Engine 6-17
yellow
blue
6-17
As shown in the chart, if you have the 3100 V6 engine,
SAE 5W
-
30 is best for your vehicle. However, you can
use SAE 10W
-
30 if it’s going to be 0
F (
-
18
C) or
above. These numbers on an oil container show its
viscosity, or thickness. Do not use other viscosity oils,
such as SAE 20W
-
50.
3800 or 3800 Supercharged Engine