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Comprehensive LML Duramax Service Schedule

LML Maintenance Guide

Maintenance Guide for 2011-2016 Chevy HD & GMC HD trucks featuring the 6.6L LML Duramax Diesel Engine

It’s no secret that Diesel engines, if properly taken care of, can last decades. Every day you probably drive by diesel trucks from the 1990’s or even the 80’s. How can you make sure your diesel truck lasts just as long? The biggest factor is preventative maintenance. If you take care of your truck, it will take care of you. What maintenance and service tasks can you complete to preserve your LML? Everything you need is in this comprehensive LML Duramax service schedule. Everything in our maintenance guide listed below is based off of GM’s recommended LML Duramax maintenance intervals.

LML Duramax Service Schedule
LML Duramax – Photo from Chevrolet Media

LML Duramax Service Schedule: Normal Conditions

The frequency at which you will need to complete maintenance on your LML Duramax vary greatly. If you are constantly driving in heavy traffic, idling excessively, or towing heavy loads you will need to follow GM’s Severe maintenance schedule. Otherwise, the normal LML Duramax service schedule is just fine.

Maintenance/ServiceMilesKilometers
Change Oil7,500 miles12,000 km
Rotate tires7,500 miles12,000 km
Change Oil
Filter
7,500 miles12,000 km
Change Fuel
Filter
Every 22,500 miles or
when CHANGE FUEL
FILTER message displays
36,000 km
Replace Air
Filter
45,000 miles72,000 km
Change Cabin Air
Filter
22,500 miles or every 2 years36,000 km
Flush Cooling
System
150,000 miles or every
5 years
240,000 km
Replace Transmission
Fluid
45,000 miles 72,000 km
Change External
transmission filter
45,000 miles72,000 km
Change internal
transmission filter
97,500 miles156,000 km
Replace Transfer
Case Fluid
97,500 miles156,000 km
Replace Rear
Differential Fluid
GM doesn’t mention any
recommended service intervals;
we recommend every 100,000
miles or sooner
160,000 km
Replace Front
Differential Fluid
GM doesn’t mention any
recommended service intervals;
we recommend every 100,000
miles or sooner
160,000 km
LML Duramax Severe Service Schedule

LML Duramax Maintenance Schedule: Severe Conditions

Maintenance/ServiceMilesKilometers
Change Oil7,500 miles12,000 km
Rotate Tires7,500 miles12,000 km
Change Oil
Filter
7,500 miles12,000 km
Change Fuel
Filter
Every 22,500 miles or
when CHANGE FUEL
FILTER message displays
36,000 km
Replace Air
Filter
45,000 miles72,000 km
Flush Cooling
System
150,000 miles or every
5 years
240,000 km
Replace Transmission
Fluid
45,000 miles 72,000 km
Change External
transmission filter
45,000 miles 72,000 km
Change internal
transmission filter
45,000 miles 72,000 km
Replace Transfer
Case Fluid
22,500 miles36,000 km
Replace Rear
Differential Fluid
GM doesn’t mention any
recommended service intervals;
we recommend every 100,000
miles or sooner
160,000 km
Replace Front
Differential Fluid
GM doesn’t mention any
recommended service intervals;
we recommend every 100,000
miles or sooner
160,000 km

LML Duramax Maintenance Parts List

When swapping filters or changing the oil on your 6.6L LML Duramax you need to use parts that meet or exceed OEM specifications. I recommend using OEM parts from GM or ACDelco. By using OEM parts, you can guarantee you’re consistently getting quality parts. Links directly to these products on Amazon are listed below.

Part TypePart #Amazon Link
Engine Oil15W-40ACDelco 15W40
Shell Rotella T4 15W40
Engine Oil FilterPF2232PF2232
Fuel FilterACDelco TP3018
23304096
ACDelco TP3018
Cabin Air FilterCF 188ACDelco CF 188
Engine Air FilterACDelco A3141CACDelco A3141C
CoolantDex-Cool
12346290
50/50 Mix
Dex-Cool 12346290
Transmission FluidDexron VI Full
Synthetic
Dexron VI
External Transmission
Filter
ACDelco TF950
Allison 29539579
ACDelco TF950
Allison 29539579
Internal Transmission
Filter
GM 29542833GM 29542833
Transfer Case FluidDexron VI Full
Synthetic
Dexron VI
Front Differential
Fluid
SAE 75W-90
Synthetic Axle
Lubricant
75W90
Rear Differential FluidSAE 75W-90
Synthetic
Axle Lubricant
75W90
Diesel Exhaust FluidN/APeak BlueDEF

Learn More About The LML Duramax

Want to learn more than about your LML? Check out our other posts about the LML Duramax.

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ABOUT Kamil

Founder of Diesel Resource and a complete diesel head. Has a little bit of problem buying too many trucks. Learn more about him by checking out his truck.