Oldsmobile 1999 Aurora - Manual (Page 265)

yellow blue
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Adding Washer Fluid
There are two windshield washer fluid tanks. The upper
tank (shown above) will empty first. When the lower
tank contains 0.5 quarts (0.5 liters) or less, the message
LOW WASHER FLUID will be displayed on the Driver
Information Center.
Open the cap labeled WASHER FLUID ONLY. Add
washer fluid until the tank is full.
NOTICE:
D When using concentrated washer fluid,
follow the manufacturer’s instructions for
adding water.
D Don’t mix water with ready - to - use washer
fluid. Water can cause the solution to freeze
and damage your washer fluid tank and
other parts of the washer system. Also,
water doesn’t clean as well as washer fluid.
D Fill your washer fluid tank only
three - quarters full when it’s very cold. This
allows for expansion if freezing occurs,
which could damage the tank if it is
completely full.
D Don’t use engine coolant (antifreeze) in
your windshield washer. It can damage
your washer system and paint.