Cummins Maintenance Schedule

Recommended Service Intervals for 5.9L & 6.7L Cummins Diesels

Manufacturer recommended maintenance intervals for the 5.9L Cummins 12v, 5.9L Cummins 24v, and 6.7L Cummins Turbodiesels. Regular service maximizes engine performance, efficiency, and most importantly, longevity. In addition to the listed regularly scheduled maintenance items, the following items should be checked at or between oil change intervals: brake fluid level, transmission fluid level, air filter condition, and serpentine belt condition - replace, repair, or service as required.

5.9L Cummins 12v Maintenance Schedule

Procedure

Interval

Description

Oil & Oil Filter Change

Normal: 6,000 miles or 6 months

Severe Duty***: 3,000 miles or 3 months

Change engine oil & engine oil filter.

Lube Chassis

Every oil change

Grease/lubricate tie rods & front suspension components.

Air Filter Replacement

Check at every oil change. Replace as necessary.

Replace engine air filter.

Fuel Filter Replacement

Normal: 12,000 miles or 12 months
Severe Duty: 6,000 miles

Replace diesel fuel filter.

Tire Rotation

6,000 miles

Rotate tires to prevent uneven wear.

Change Front/Rear Axle Fluid

Normal: 45,000 miles
Severe Duty: 24,000 miles

Change front & rear axle fluids (front on 4 wheel drive models only).

Flush & Change Engine Coolant

24,000 miles or 24 months

Flush engine coolant system and replace with new coolant.

Automatic Transmission Service

24,000 miles

Change automatic transmission fluid & auto transmission filter. Adjust automatic transmission bands.

Adjust Valve Lash

24,000 miles or 24 months

Adjust valve lash clearance.

 

5.9L Cummins 24v ISB Maintenance Schedule

Procedure

Interval

Description

Oil & Oil Filter Change*

Normal: 15,000 miles or 12 months
Severe Duty***: 7,500 miles or 6 months
7,500 miles/6 mo recommended for most driving conditions

Change engine oil & engine oil filter.

Lube Chassis

Every oil change or 7,500 miles

Grease/lubricate tie rods & front suspension components.

Air Filter Replacement

Check every oil change. Replace as necessary. Truck is equipped with a "Filter Minder" to prompt replacement.

Replace engine air filter.

Fuel Filter Replacement

15,000 miles

Replace diesel fuel filter.

Tire Rotation

7,500 miles

Rotate tires to prevent uneven wear.

Change Front/Rear Axle Fluid

Normal: N/A
Severe Duty: 15,000 miles

Change front & rear axle fluids (front on 4 wheel drive models only).

Change Transfer Case Fluid

Normal: N/A
Severe Duty: 120,000 miles

Change transfer case fluid (4 wheel drive models only).

Flush & Change Coolant

100,000 miles or 60 months

Flush engine coolant system and replace with new coolant.

Transmission Service

Automatic: 30,000 miles

Change automatic transmission fluid & auto transmission filter. Adjust automatic transmission bands. Change manual transmission fluid.

Adjust Valve Lash

150,000 miles

Adjust valve lash clearance.

 

6.7L Cummins Maintenance Schedule

(Note - does not include 2013+ model years, please refer to your owners manual)

Procedure

Interval

Description

Oil & Oil Filter Change*

7,500 miles or 6 months

Change engine oil & engine oil filter.

Lube Chassis

7,500 miles

Grease/lubricate tie rods & front suspension components.

Air Filter Replacement

Check every oil change. Replace as necessary. Truck is equipped with a "Filter Minder" to prompt replacement.

Replace engine air filter.

Fuel Filter Replacement

15,000 miles or 12 months

Replace diesel fuel filter.

Tire Rotation

7,500 miles

Rotate tires to prevent uneven wear.

Change Front/Rear Axle Fluid

15,000 miles

Change front & rear axle fluids (front on 4 wheel drive models only).

Change Transfer Case Fluid

60,000 miles or 48 months

Change transfer case fluid (4 wheel drive models only).

Clean EGR Cooler

67,500 miles

Clean EGR (exhaust gas recirculation) cooler.

Clean EGR Valve

67,500 miles

Clean EGR (exhaust gas recirculation) valve.

Replace CCV Filter

67,500 miles

Replace CCV (crankcase ventilation) filter.

Flush & Change Coolant

100,000 miles or 60 months

Flush engine coolant system and replace with new coolant.

Transmission Service

Normal: 120,000 miles
Severe Duty***: 60,000 miles

Change automatic transmission fluid & auto transmission filter. Change manual transmission fluid.

Adjust Valve Lash

150,000 miles

Adjust valve lash clearance.

 

* Truck may be equipped with an Engine Oil Indicator System that will prompt driver when an oil change is required. Perform an oil change whenever prompted by this system, every 7,500 miles, or every 6 months (whichever comes first).

** In instances where intervals are listed in "miles or months", the procedure should be performed at whichever interval comes first.

*** Severe duty refers to driving conditions which exhibit any of the following:
- Frequent short trips that prohibit the engine from reaching its normal operating temperature.
- Extensive idling (idling more than 10 minutes per 1 hour of driving).
- Driving off-road or in dusty conditions.
- Frequent trailer towing.
- Commercial service (work trucks, Police, taxi, etc).
- Driving at high speeds or under excessive engine load for extended periods (driving at more than 2,900 rpm or at 70% throttle).