Chevrolet 1998 Lumina Owner's Manual page 253

RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS
FOR BEST FUEL EC------' 1 AND COLD STARTING, -----I THE LOWEST
SAL VISCOSITY 6L-b
wml
FOR THE EXPECTED TCmmrw,ATURE RANGE.
HOT
WEATHER
7
"F
+
10(
+ a m
+
60
+
40
+ 20
0
f
7
"C
+
38
+
27
+
16
c 4
- 7
-
18
COLD
WEATHER
r
' - 3 0
RED
DO NOT USE SAE
2OW-50 OR
ANY OTHER
GRADE OIL NOT RECOMMENDED
c
As shown in the chart, if you have the 3100 engine,
SAE 5W-30 is best for your vehicle. However, you
can use S A E 1OW-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 S A E 20W-50.
6-15