Chevrolet MONTE CARLO 1998 Manual page 236

RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS
FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST
SAE VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE.
HOT
WEATHER
I
"F
+ 100,
+
80.
+
60
+ 40.
t
20
'
0 .
1
7
"C
t
3a
+
27
+
16
e 4
- 7
-
la
11
PREFERRED
SAE
I'
5W-30
1 1 1
S A I
LOOK
FOR M I S
SYMBOL
WEATHER
DO NOT USE SAE 2OW-50 OR ANY OTHER
GRADE OIL NOT RECOMMENDED
As shown in the chart, if you have the 3 100 engine,
SAE 5W-30 is best for your vehicle. However, you
can use SAE low-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.
6-15