C - Peterbilt Motors Company

Cold Weather Starting
General Information
Follow the “Normal Starting Procedure”
on page 4-4.
Refer to the vehicle operator’s manual
instructions for any additional cold
weather starting procedures.
If starting a cold engine, slowly
increase the engine speed. This
provides adequate lubrication to the
bearings and gives ample time to allow
the oil pressure to stabilize.
The use of cold starting aids are
not recommended for ambient
temperatures above 0° F (-18° C).
If an engine must idle for an extended
period of time, it should be done at
a fast idle (1000 rpm maximum) at
coolant temperatures below 150° F
(70° C).
For coolant temperatures above 150°
F (70° C), use a low gear and drive
at moderate engine speed until the
engine coolant has reached operating
temperature. Do not let the engine idle
longer than necessary.
CAUTION: Do not operate
the engine at low idle for
long periods of time when
the coolant temperature is
below the normal operating
range. This could result in
the following:
• Fuel dilution of the
lubricating oil
• Carbon buildup in the
cylinder
• Sticking of the valves in
the cylinder head
• Reduced performance
• Damage to aftertreatment
components
Operating Instructions
Starting Procedure After
Extended Shutdown or Oil
Change
General Information
Follow the “Normal Starting Procedure”
on page 4-4.
4-5
4