Service Station Checks - GMC 1994 Sonoma Owner's Manual

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 if necessary.
Check the engine coolant level and add if necessary.
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Check the windshield washer fluid level and add if necessary.
See the Index under these items for information on how to check them.