Paccar PX 8 Operator's Manual - page 72
Maintenance Specifications
– 66 –
Y53-1030A 12/09
PACCAR
CAUTION: A sulfated ash limit of 1.85 percent
has been placed on all engine lubricating oils
recommended for use in PACCAR engines.
Higher ash oils can cause valve and/or piston
damage and lead to excessive oil consumption.
CAUTION: The use of a synthetic-base oil does
not justify extended oil change intervals.
Extended oil change intervals can decrease
engine life due to factors such as corrosion,
deposits, and wear.
Aftermarket Oil Additive Usage
PACCAR does not recommend the use of aftermarket oil
additives. The present high-quality fully additive engine lubri-
cating oils are very sophisticated, with precise amounts of
additives blended into the lubricating oil to meet stringent
requirements. These furnished oils meet performance char-
acteristics that conform to the lubricant industry standards.
Aftermarket lubricating oil additives are not necessary to
enhance engine oil performance and in some cases can
reduce the furnished oil's capability to protect the engine.
Coolant Recommendations and
Specifications
Fully Formulated Coolant/Antifreeze
The cooling system in your vehicle was factory filled with
Extended Life Coolant (ELC) that meets or exceeds all
ASTM D 6210 requirements. PACCAR recommends only
using a 50/50 mixture of distilled water and ELC when cool-
ing system service is required. A 50/50 mixture of ELC and
distilled water will provide freeze protection down to -34°F
(-36.7°C), which is adequate for most locations in North
America. For extremely cold operating conditions, a 60/40
mixture (coolant/water ratio) can be used to provide freeze
protection down to -62°F (-52.2°C).
Your engine is also equipped with a Coolant Filter designed
to capture and remove harmfuil deposits from the cooling
system to help prolong system life.