OPERATOR'S MANUAL

Preventive Maintenance Engine Maintenance
Medium Duty
(R05/09) Y53-6027 – 173 –
ENGINE MAINTENANCE
WARNING! Exhaust fumes from the engine con-
tain carbon monoxide, a colorless and odorless
gas. A poorly maintained, damaged, or corroded
exhaust system can allow carbon monoxide to
enter the cab or sleeper. Failure to properly
maintain your vehicle could cause carbon mon-
oxide to enter the cab and cause death, personal
injury or serious illness.
WARNING! Never idle your vehicle for prolonged
periods of time if you sense that exhaust fumes
are entering the cab. Investigate the cause of the
fumes and correct it as soon as possible. If the
vehicle must be driven under these conditions,
drive only with the windows slightly open. Fail-
ure to repair the source of the exhaust fumes
may lead to death, personal injury or serious ill-
ness.
NOTE: Keep the engine exhaust system and the
vehicle’s cab ventilation system properly main-
tained. It is recommended that the vehicle’s
exhaust system and cab be inspected:
• By a competent technician every 15,000 miles.
• Whenever a change is noticed in the sound of the
exhaust system.
• Whenever the exhaust system, underbody, cab or
sleeper is damaged.
Engine Lubrication
Proper engine lubrication depends on ambient temperature
and where the vehicle will be operated. Use the recom-
mended oil for the weather conditions outside.
NOTE: For engine oil specifications, oil change
intervals, engine filter requirements or general
engine maintenance procedures, refer to the Engine
Operation Manual included with your vehicle or the
engine manufacturer’s service manual.
Service Intervals
• Check engine oil daily.