Buick 2003 LeSabre Owner's Manual page 290

What to Use
When you need windshield washer fluid, be sure to read
the manufacturer's instructions before use. if you will
be operating your vehicle in an area where the
temperature may fall below freezing, use a fluid that
has sufficient protection against freezing. See Engine
Compartment Overview on page 5- 12 for reservoir
location.
Open the cap with the
washer symbol on it.
Add washer fluid until the
tank is full.
e
e
e
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 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.
Fill your washer fluid tank only three-quarters
full when it's very cold. This allows for
expansion if freezing occurs,which-cauld
damage the tank if
it
is completely full.
Don't use engine coolant (antifreeze) in your
windshield washer. It can damage your
washer system and paint.
5-39