Maintenance Specifications
PACCAR Y53-1030A 12/09 – 69 –
Recommended Extended Life Coolant Suppliers
CAUTION: Do not use a floating ball hydrometer.
The use of floating ball hydrometers can give an
incorrect reading. Using a floating ball hydrome-
ter for testing the freezing point of the coolant is
an inaccurate test and will cause a false reading
of the coolant freezing point. Use a refractome-
ter to obtain an accurate test of the coolant
freezing point.
Brand Name Supplier
Authorized PACCAR engine
dealer
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