6.6L Duramax Maintenance Schedule

Service Intervals, Part Numbers, & Fluid Capacities for all 6.6L Duramax Engines

When purchasing parts for your Duramax, be cautious with model years where an engine was phased in/out as the incoming engine may have parts that are not interchangeable with the outgoing engine. You can use our VIN ID table to verify the engine that your truck is equipped with. Always follow the severe duty maintenance schedule if you're driving conditions include:

• Idling for excessive periods
• Frequently traveling on short trips or under conditions that require frequent engine on/off cycles without reaching full operating temperature
• Driving off-road (or frequent 4 wheel drive use)
• Frequent towing/hauling
• Driving in extremely cold or hot environments

6.6L Duramax Maintenance Schedule, Service Intervals

Replace engine oil & oil filter

10,000 miles or when "change engine oil" message is displayed by the oil life monitoring system

Replace fuel filter

2003 - 2010

15,000 miles

2011 - 2016

22,500 miles or when "change fuel filter" message is displayed

Replace engine air filter

Check filter condition every oil change and replace as necessary; replace at 45,000 miles regardless

Flush engine cooling system

150,000 miles

Replace automatic transmission fluid & filters

2001 - 2011

50,000 miles (normal conditions)
25,000 miles (severe duty conditions)

2012 - 2016

Replace external filter at 45,000 mile intervals and full service at 97,500 miles under normal conditions
Perform full service (new fluid, ext & int filter) every 45,000 miles under severe duty conditions

Replace manual transmission fluid

GM advises that the ZF S6-650 6 speed manual transmission does not require service. To maintain shift quality and promote transmission life, consider replacing fluid at 60,000 mile intervals, especially if usage meets any of the severe duty conditions.

Replace transfer case fluid

2001 - 2011

50,000 miles

2012 - 2016

97,500 miles (normal conditions)
22,500 miles (severe duty conditions)

Replace front differential fluid (4x4)

Service interval not provided by GM, routine service may promote longevity. Fluid level should be checked periodically. Drain and replace differential fluid immediately if the axle is submerged in water.

Replace rear differential fluid

Service interval not provided by GM, routine service may promote longevity. Fluid level should be checked periodically. Drain and replace differential fluid immediately if the axle is submerged in water.

6.6L Duramax Service Part Numbers

Part numbers based on Silverado/Sierra trucks - some parts may not be compatible with Sierra/Express vans

Engine air filter

2001 - 2005

ACDelco A1618C

2006 - 2010

ACDelco A3087C

2011 - 2016

ACDelco A3141C

Engine oil filter

ACDelco PF2232

Oil pan drain plug

GM 11569943

Fuel filter

ACDelco TP3018

Fuel pump

2001 - 2014 (inline pump)

ACDelco EP1037, Delphi HFP955

2015 - 2016
(153.7", 144.2" wheelbase, in tank)

ACDelco MU1977 (GM 19257327)

2015 - 2016
(133.6", 158.1" wheelbase, in tank)

ACDelco MU1976 (GM 19257326)

Serpentine belt

2001 (105 amp alt)

ACDelco 6K1114, Gates K061114

2001 (130 amp alt)

ACDelco 6K1123, Gates K061123

2002 - 2016 (single alt)

ACDelco 6K1195, Gates K061195

Glow plug[1]

2001 - 2004 LBZ
(VIN 1 only, NOT 2004 LLY)

ACDelco 62G

2004 - 2005 LLY
(VIN 2 only, NOT 2006 LLY)

ACDelco 63G

2006 - 2016
(all engines)

ACDelco 9G (replaces ACDelco 61G)

Thermostat[2]

2001 - 2014

ACDelco 12T100D (front), ACDelco 12T99D (rear, alternative p/n 131131)

2015 - 2016

ACDelco 131-131

Thermostat housing gasket

ACDelco 97223686

Coolant reservoir cap

2001 - 2010

ACDelco RC85

2011 - 2016

ACDelco RC115

Upper radiator hose

2001 - 2005

ACDelco 24485L, Gates 22698

2006 - 2008

ACDelco 24589L, Gates 23227

2009 - 2010

ACDelco 24655L, Gates 23499

2011 - 2014

ACDelco 27035X, Gates 23721

2015 -2016

GM 22884211, Dayco 72554

Lower radiator hose

2001 - 2005

ACDelco 26397X, Gates 22650

2006 - 2010

ACDelco 26570X, Gates 23260

2011 - 2014

ACDelco 27099X, Gates 23962

Camshaft position sensor (CPS)

2001 - 2004
(LBZ, VIN 1)

GM 2134274 (alternative 2132485)

2004.5 - 2015
(2004 LLY only, VIN 2)

GM 97365038

2016

GM 1267264

Crankshaft position sensor (CKP)

2001 - 2004
(LBZ, VIN 1)

GM 2134277 (alternative 2132486)

2004.5 - 2015
(2004 LLY only, VIN 2)

GM 9765037

2016

GM 12672641

Automatic transmission filter

External filter, 2001 - 2016

ACDelco TF950, Allison 29539579

Internal filter, 2001 - 2005

GM 29537965

Internal filter, 2006 - 2010

ACDelco TF920

Internal filter, 2011 - 2016

GM 29542833

Transmission pan gasket

ACDelco 29549684

[1]Model years with engine crossovers should have engine model verified by VIN number before ordering glow plugs. Glow plugs are not interchangeable with all model years. See: Duramax engine models by VIN number
[2] 2001 to 2014 model year engines use a dual thermostat system, 1 front and 1 rear mounted thermostat.

6.6L Duramax Fluid Specifications & Capacities

Note - fluid capacities are nominal; always fill to proper level as indicated by dipstick, to the bottom of the fill plug, etc. The fluid capacities listed herein are measured in U.S. quarts ("qts") and/or pints ("pts"), NOT Imperial units. Always verify fluid specifications and capacities in your owners manual, if applicable.

Engine oil

15W-40

Preferred viscosity, ambient temp > 0° F

10 qts w/ filter change

5W-40

Preferred viscosity, ambient temp < 0° F, acceptable in all temps

10W-30

Listed as acceptable for certain model years - not advised

Engine coolant

50/50 DEX-COOL 12346290 engine coolant , distilled water

22.0 - 31.4 quarts (5.5 - 7.85 gallons)
Refer to owners manual for application specific coolant capacity

Automatic transmission fluid

2001 - 2005 (5 spd)

DEXRON III automatic transmission fluid (replaced by ACDelco 10-9243)

7.4 qts service refill
12.7 qts total capacity

2006 - 2016 (6 spd)

DEXRON VI automatic transmission fluid (ACDelco 10-9243)

Manual transmission fluid

ZF S6-650 (6 spd)

GM TranSynd full synthetic transmission fluid (GM 12378515)

5.8 qts

Transfer case fluid

2001-2007 manual shift

DEXRON III automatic transmission fluid (replaced by ACDelco 10-9243)

2.0 qts

2001 - 2007 auto shift

AUTO-TRAK II (GM 12378508)

2.0 qts

2008 - 2016

DEXRON VI automatic transmission fluid (ACDelco 10-9243)

1.6 qts

Front differential fluid

2003 - 2010

SAE 80W-90 synthetic gear oil

1.8 qts

2011 - 2016

SAE 75W-90 synthetic gear oil

1.8 qts

Rear differential fluid

SAE 75W-90 synthetic gear oil

3.2 - 4.3 qts (varies by MY)

DEF tank capacity

5.3 gallons