1997 Buick Regal Owner's Manual - Page 303

What to Use To determine what kind of fluid to use, see "Recommended Fluids andLubricants'' in the Index. Always use theproper fluid. Failure touse the proper fluid can cause leaks and damage hoses and seals. Adding Washer Fluid Windshield Washer Fluid What to Use When you need windshield washer fluid, be sure to read the manufacturer's instructions beforeuse. If you will be operatingyourvehicle in an area where the temperature may fall below freezing, use a fluid that has sufficient protection against freezing. 1 Open the cap labeled WASHER FLUID ONLY. Add washer fluid until the tank is full.