Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Maintenance Schedule and Lubrication
Preventive Maintenance
NOTE: Keep the engine exhaust system and the
vehicle’s cab ventilation system properly maintained.
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.
– 138 – Y53-6008 Medium Duty (R10/06)