Chevrolet 1993 S-10 Pickup Owner's Manual page 333

Service Station Checks
It is important for you or a service station attendant to perform these
under-hood checks at each fuel fill.
Check the engine oil level and add i f necessary.
Check the engine coolant level and add if necessary.
Check the windshield washer fluid level and add if necessary.
See the Index under these items for information on how to check them.
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