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LB7 Duramax Maintenance Schedule, Fluid Specs, And Parts

2001-2004 Duramax Maintenance Schedule

The LB7 Duramax was incredibly impressive for its time. Over the years, we’ve found out just how reliable and capable the trucks are. That doesn’t mean they don’t have any problems though. What is the best way to reduce the likelihood of LB7 Duramax problems? You can dramatically reduce the amount of problems by following GM’s recommended LB7 Duramax Maintenance schedule and service intervals.

LB7 Duramax Maintenance Schedule
LB7 Duramax from @T_C_Customs

Below I have two charts explaining what services need to be completed at certain intervals. There are two different maintenance intervals you can follow with your LB7 Duramax. Which one you follow depends on how you use your truck. Read the short paragraphs for each chart to determine if that is the proper LB7 Duramax maintenance schedule for you to follow.

Maintenance Intervals – Normal Conditions

The normal conditions maintenance scheduled should be followed by most people. If you use your truck mostly as just a daily driver, and don’t tow heavy loads frequently, this should be the maintenance interval you follow for your LB7 Duramax.

Maintenance/ServiceMilesKilometers
Change Oil10,000 miles16,000 km
Change Oil
Filter
10,000 miles16,000 km
Change Fuel
Filter
15,000 miles24,000 km
Replace Air
Filter
Check At Every Oil Change;
Replace when necessary. Consider
replacing air filter every 30-45,000
miles. If you frequently drive in
dusty conditions you may need
to change your air filter more often.
48,000 km-
72,000 km
Flush Cooling
System
150,000 miles240,000 km
Change Manual
transmission fluid
No Interval Given; Consider
servicing every 50-75,000 miles.
80,000 km-
120,000 km
Replace Automatic
Transmission Fluid
50,000 miles80,000 km
Change External
transmission filter
50,000 miles80,000 km
Change internal
transmission filter
50,000 miles80,000 km
Replace Transfer
Case Fluid
50,000 miles80,000 km
Replace Rear
Differential Fluid
Not Provided; We Recommend
changing fluid every 100,000 miles.
If axle is submerged underwater,
replace fluid ASAP.
See Left
160,000 km
Replace Front
Differential Fluid
Not Provided; We Recommend
changing fluid every 100,000 miles.
If axle is submerged under water,
replace fluid ASAP.
See Left
160,000 km

Maintenance Intervals – Severe Conditions

If you tow or idle frequently, you need to follow the severe conditions LB7 Maintenance schedule. This is especially important if you tow heavy loads. Heavy towing can take a big toll on your LB7 Duramax. You’ll need to complete common maintenance tasks like changing the oil and transmission fluid more frequently.

Maintenance/ServiceMilesKilometers
Change Oil5,000 miles8,000 km
Replace Oil
Filter
5,000 miles8,000 km
Change Fuel
Filter
15,000 miles24,000 km
Replace Air
Filter
As needed; check air filter
at every oil change. Replace if
necessary. We recommend
20-30,000 mile intervals if
driving in dusty conditions.
32,000 km-
48,000 km
Flush Cooling
System
150,000 miles240,000 km
Replace Automatic
Transmission
Fluid
25,000 miles40,000 km
Change Manual
transmission fluid
No Interval Given; Consider
servicing every 50-75,000 miles.
80,000 km-
120,000 km
Change External
transmission filter
25,000 miles40,000 km
Replace internal
transmission filter
25,000 miles40,000 km
Replace Transfer
Case Fluid
50,000 miles80,000 km
Replace Rear
Differential Fluid
Not Provided; We Recommend
changing fluid every 100,000 miles.
If axle is submerged underwater,
replace fluid ASAP.
See Left
160,000 km
Replace Front
Differential Fluid
Not Provided; We Recommend
changing fluid every 100,000 miles.
If axle is submerged underwater,
replace fluid ASAP.
See Left
160,000 km

LB7 Duramax Oil, Fluid, And Filter Specs

If you want to keep your first generation Duramax running in excellent condition, you’re going to have to use the right fluid and oil. Not all fluids are created equal though. The best way to assure your LB7 Duramax gets the right fluids and oil is to stick with OEM recommended fluids. We recommend using OEM GM or ACDelco Fluids for everything. In the chart below, you’ll find the best engine oil, filters, and fluids to use for your LB7 Duramax. Click on one of the links in the chart to find that product on Amazon.

Fluid Type:Part #:
Engine Oil15W-40
ACDelco 15W-40
Shell Rotella T4 15W-40
Shell Rotella T5 15W-40
Engine Oil FilterACDelco PF2232
Fuel FilterACDelco TP3018
CoolantDex-Cool 12346290 50/50 mixture
Pre-Diluted Dex-Cool 12378390
Automatic Transmission
Fluid
Dexron III Automatic Transmission Fluid
AC Delco 10-9240
Replaced by Dexron VI Automatic
Transmission Fluid – AC Delco 10-9243
Transmission pan
gasket
29549684
Internal Transmission
Filter
Shallow Pan: 29537965
Deep Pan: 29542824
External Transmission
Filter
ACDelco TF950 or Allison 29539579
Transmission Filter
Kit
Shallow Pan Filter Kit
Deep Pan
Manual Transmission
Fluid
TransSynd Synthetic Automatic
Transmission Fluid 10-4029 OR
GM 12378515
Automatic Transfer
Case
Automatic Transfer Case Fluid
Auto Trak 2
Manual Transfer CaseDexron III Automatic Transmission Fluid
ACDelco 10-9240 – Replaced by Dexron VI
Automatic Transmission Fluid
(AC Delco 10-9243)
Front Differential FluidSAE 80W-90
Rear Differential FluidSAE 75W-90

LB7 Duramax Oil & Fluid Capacity

Fluid/Oil TypeCapacity – QuartsCapacity – Liters
Engine Oil /w Filter10 quarts9.5 Liters
Coolant
/w Auto Trans.
/w Manual Trans.
See below
20.3 quarts
20.7 quarts
See below
19.2 Liters
19.6 Liters
Automatic Transmission
Refill:
After Overhaul:
See Below
7.4 quarts
12.7 quarts
See Below
7 Liters
12 Liters
ZF-6 Manual Transmission6.3 quarts6 Liters
Transfer Case
Manual Shift
Auto Shift
See Below
2 quarts
2 quarts
See Below
1.9 Liters
1.9 Liters
Front Differential
8.25″ Axle
9.25″ Axle
See Below
1.75 quarts
1.83 quarts
See Below
1.66 Liters
1.73 Liters
Rear Differential
8.6″ Axle
9.6″ Axle
10.5″ Axle
11.5″ Axle
See Below
2.41 quarts
2.75 quarts
2.75 quarts
3.83 quarts
See Below
2.28 Liters
2.6 Liters
2.6 Liters
3.62 Liters
Fuel Capacity
Short Bed
Long Bed
See Below
28 Gallons
34 Gallons
See Below
98 Liters
128 Liters
Power Steering (Approximate).81-1.32 quarts.77-1.25 Liters

Want to Learn More about your truck?

Visit our other LB7 Duramax resources and informational articles. Click on the links listed below.

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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.