6.6L Duramax Maintenance Schedule

Duramax Routine Maintenance Guide

Frequent Service Checks:

Check the following at every oil change interval or between oil changes and service as necessary.

• Brake fluid level

• Automatic transmission fluid level

• Air filter condition

• Engine coolant level

• Check exhaust system for leaks

• Condition of drive belt (check for cracks and/or wear)

• Check axle oil level (every other oil change is sufficient)

2001 - 2010 6.6L Duramax Maintenance Schedule (LB7, LLY, LBZ, LMM):

Maintenance Procedure:	Interval:	Description:
Oil & Oil Filter Change*	Recommended: 5,000 - 7,500 miles, 8 months, or within 600 miles of "CHANGE ENGINE OIL" alert. Maximum: 10,000 miles or 12 months.	Change engine oil and engine oil filter.
Lube Chassis	Every oil change	Lubricate chassis components, including ball joints, front suspension, transmission shift linkage, parking brake cables, and steering linkage.
Air Filter	Check at every oil change.	Replace air filter if necessary (inspect filter change indicator).
Replace Fuel Filter	Every 15,000 miles	Replace fuel filter.
Allison Auto Trans Service	Normal Duty: Every 50,000 miles Severe Duty**: Every 25,000 miles	Change automatic transmission fluid & filter.
Rotate Tires	Every 7,500 - 15,000 miles	Check tires for uneven or excessive wear. Rotate tires. Replace tires as necessary.
Inspect Brakes	Every other oil change (approximately once every year)	Inspect brake pads, rotors, fluid, and lines. Replace as necessary.
Change Auto Transfer Case Fluid	Every 100,000 miles	Change transfer case fluid in automatic (not manual) transfer case only.
Flush & Replace Coolant	Every 150,000 miles or 60 months	Perform coolant system flush.

6.6L Duramax Maintenance Schedule (LML):

Maintenance Procedure:	Interval	Description
Oil & Oil Filter Change	5,000 miles or within 600 miles of "CHANGE ENGINE OIL" alert.	Change engine oil and engine oil filter.
Lube Chassis	Every oil change	Lubricate chassis components, including ball joints, front suspension, transmission shift linkage, parking brake cables, and steering linkage.
Air Filter	Recommended: Inspect at every oil change. Inspect at maximum 15,000 miles.	Replace air filter if necessary (inspect filter change indicator).
Replace Fuel Filter	Every 15,000 miles	Replace fuel filter.
Allison Auto Trans Service	Normal Duty: Every 50,000 miles Severe Duty**: Every 25,000 miles	Change automatic transmission fluid & filter.
Rotate Tires	Every 7,500 miles	Check tires for uneven or excessive wear. Rotate tires. Replace tires as necessary.
Inspect Brakes	Every other oil change or once per year.	Inspect brake pads, rotors, fluid, and lines. Replace as necessary.
Change Auto Transfer Case Fluid	Every 100,000 miles	Change transfer case fluid in automatic (not manual) transfer case only.
Flush & Replace Coolant	Every 150,000 miles or 60 months	Perform coolant system flush.
Add Diesel Exhaust Fluid***	Every oil change or as required.	Refill the diesel exhaust fluid tank at every oil change and as required between oil changes.

* Oil Minder: 6.6L Duramax powered trucks are equipped with an Engine Oil Life System. The oil change intervals listed are the maximum mileage between oil changes. The Engine Oil Life System monitors mileage and driving conditions and will alert you when your oil should be changed based on these conditions. As such, intervals will vary and the system may alert you to change your oil before the maximum recommended interval. Oil changes should be performed at intervals relative to how the vehicle is driven.

** Severe Duty: Severe duty driving conditions include (but are not limited to) - repeatedly driving in heavy city traffic in ambient temperatures greater than 90 degrees F, driving in hilly/mountainous terrain, frequently towing a trailer or hauling heavy objects.
*** Diesel Exhaust Fluid (DEF): Without diesel exhaust fluid, your engine will limit your vehicle speed and engine performance until it is refilled. Refill tank at every oil change and check between oil changes to avoid running out. The engine is equipped with a "DEF LOW" alert.

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