1997 Buick Riviera Owner's Manual - Page 264

Adding Washer Fluid NOTICE: 0 0 0 Open .the .labeledWASHER FLUID ONLY. Add cap is washer fluid until the tank full. 0 When using concentrated washer fluid, follow the manufacturer's instructions for adding water. Don't mix water with ready-to-use washer fluid. Water can cause the solutionfreeze to and damage your washer tank and fluid other partsof the washersystem. Also, water doesn't clean as well as washerfluid. Fill your washer fluid tank only three-quarters full whenit's very cold. This allows for expansionif freezing occurs, which could damage the tank it is if completely full. Don't use radiator antifreeze in your windshield washer. It can damage your washer systemand paint. 6-27