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Complete L5P Duramax Service Schedule & Maintenance Guide

L5P Duramax Maintenance Schedule & Service Intervals

2017+ Chevrolet Silverado HD & GMC Sierra HD Diesel Service Schedule

As with all automobiles, proper maintenance plays a crucial role in increasing the useful life of your truck. This is especially important on modern diesels like the newest 6.6L Duramax. They’re very powerful and capable, but they’re also very vulnerable to poor fuel quality. Luckily, this can be addressed by following the proper L5P Duramax Service schedule. You shouldn’t try and see how long you can go without changing your oil or replacing your fuel filters. While sometimes maintenance can be expensive, it’s worth the investment. You shouldn’t cheap out on good quality oil or fluids too. I use only high quality oils and fluids in my trucks. Anything you choose should meet or exceed OEM standards.

Looking to maintain your truck by yourself? Check out the charts below to determine when you need to perform regular maintenance tasks on your L5P. Please keep in mind that you should always double check your owners manual or contact GM directly to make sure anything you purchase will work properly with your truck. You can also visit our Fluid Capacity & Recommendations for the L5P resource to find out what type of fluid and oil you need. The charts listed below are based off of GM’s recommended L5P Duramax Maintenance and Service schedule.

L5P Duramax Tuning

L5P Duramax Maintenance & Service Intervals

The chart below shows general L5P Duramax maintenance and service intervals. Please keep in mind your situation may call for more frequent maintenance than what is listed below. Heavy towing or driving in extreme conditions requires more frequent maintenance. When you change your oil, check components like your air filter to make sure they are still okay. You might have to change them earlier than GM’s recommended service intervals. If your dash light comes on for something needing to be serviced, service your truck as soon as possible. Listed below are GM’s recommended maintenance schedule for trucks that are driven under normal conditions.

L5P Duramax Maintenance & Service Schedule (Normal Operating Conditions)

Maintenance/Service TypeMilesKilometers
Change Oil7,500 Miles12,000 km
Replace Oil Filter7,500 Miles12,000 km
Change Fuel Filters22,500 miles or when dash
light comes on
34,000 km
Replace Air Filter45,000 miles or every 4 years72,000 km
Flush Cooling System150,000 miles or every 5 years240,000 km
Replace Transmission
97,500 miles156,000 km
Change external
transmission filter
45,000 miles72,000 km
Replace Internal
Transmission Filter
97,500 miles under normal
driving conditions
156,000 km
Change Transfer
Case Fluid
45,000 miles72,000 km
Replace Differential FluidNot Mentioned in Owner’s
We Recommend at least
every 30-60,000 miles. If
you submerge your axles
in water or mud, change your
diff. fluid immediately
48,280 km-
96560 km

Maintenance & Service Schedule (Severe Operating Conditions)

Change Oil7,500 miles12,000 km
Replace Oil
7,500 miles12,000 km
Change Fuel
22,500 miles34,000 km
Replace Air
45,000 miles72,000 km
Flush Cooling
150,000 miles240,000 km
Replace Transmission
45,000 miles72,000 km
Change External
transmission filter
45,000 miles72,000 km
Change internal
transmission filter
45,000 miles72,000 km
Replace Transfer
Case Fluid
Not listed in
owner’s manual
45,000 miles
72,000 km
Replace Differential FluidNot Mentioned in Owner’s
We Recommend at least
every 30-60,000 miles. If
you submerge your axles
in water or mud, change your
diff. fluid immediately.
48,280 km-
96560 km

Now that you know when you should complete general maintenance tasks on your truck, you need the parts and fluids to keep your truck in tip-top shape! Everything you need is listed below. Check it out! All of these products are listed with links to purchase them. These links are affiliate links. When you purchase one of the products from the links below, we receive a commission. Thanks for your support!

L5P Duramax Maintenance Parts & Fluids

Part TypePart #Amazon Link
Engine Oil15W40Shell Rotella T4 15W40
ACDelco 15W40
Shell Rotella T5 (blend ) 15W40
Shell Rotella T6 (Full Syn.) 15W40
Lucas Oil (Full Syn.) 15W40
Mobil Delvac 15W40
Engine Oil FilterPF2232ACDelco PF2232 (1-pack)
Mobile 1 M1-303 (2 Pack)
Fuel FilterTP1015ACDelco TP1015
Cabin Air FilterCF 188ACDelco CF188
Engine Air FilterA3231CACDelco A3231C
50/50 Mix
Dex-Cool 12346290
Transmission FluidDexron VI1 qt – Dexron VI
1 Gal – Dexron VI
External Transmission
Allison 29539579
ACDelco TF950
Internal Transmission
29542833ACDelco 29542833
Transmission pan
29549684ACDelco 29549684
Transfer Case FluidDexron VI1 qt – Dexron VI
1 Gal – Dexron VI
Differential Fluid75W90ACDelco 75W90
Diesel Exhaust FluidN/APeak BlueDEF

Find out more about the L5P Duramax By Reading our other articles.

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