Chevrolet 1998 Express Van Owner's Manual page 253

Be sure to fill it enough to put the level somewhere in
the proper operating range. Push the dipstick all the way
back in when you're through.
RECOMMENDED SAE YlSCOSllY GRADE ENGINE OILS
FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST
SAE VISCOSITY GRADE 011 FOR THE EXPECTED TEMPERATURE RANGE.
What Kind of Engine Oil to Use
LOOK
FOR MIS
atfi
SYMBOL
Oils recommended for your vehicle can be identified
by looking for the "Starburst" symbol. This symbol
indicates that the oil has been certified by the American
Petroleum Institute (API). Do not use any oil which
does not carry this Starburst symbol.
HOT
WEATHER
t A
J
I
I
1f
you change your own
oil, be sure you use oil that
has the Starburst symbol
on the front of the oil
container. If you have your
oil changed for you, be sure
the oil put into your engine
is American Petroleum
Institute certified for
gasoline engines.
.
SAt d-30
PREFERRED
COLD
WEATHER
You should also use the proper viscosity oil for your
vehicle, as shown in the following chart:
DO NOT USE M E 20W.50 OR ANY OTHER
GRADE OIL NOT RECOMMENDED
I