Pontiac 1999 Firebird - Manual (Page 264)

yellow blue
6-16
3800 V6 Engine
As shown in the chart, if you have the 3800 V6 engine,
SAE 10W
- 30 is best for your vehicle. However, you can
use SAE 5W - 30 if it’s going to be colder than 60
_F
(16
_C) before your next oil change. When it’s very cold,
you should use SAE 5W - 30. These numbers on an oil
container show its viscosity, or thickness. Do not use
other viscosity oils, such as SAE 20W
- 50.
NOTICE:
Use only engine oil with the American Petroleum
Institute Certified For Gasoline Engines
“Starburst” symbol. Failure to use the
recommended oil can result in engine damage not
covered by your warranty.
GM Goodwrench
R
oil meets all the requirements for
your vehicle.
If you are in an area where the temperature falls below
- 20
_F ( - 29
_C), consider using either an SAE 5W - 30
synthetic oil or an SAE 0W - 30 oil. Both will provide
easier cold starting and better protection for your engine
at extremely low temperatures.