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L5P Duramax Fluid Capacity & Specs

2017+ GM Heavy Duty Trucks /W 6.6L L5P Diesel Engine

If you want your L5P Duramax to last you a long time, you need to maintain it properly. Knowing the proper fluids and oil to use is a major part of the equation. Once you’ve got the right fluids and oil for your L5P though, you’ll need to know the proper Fluid capacity for your truck. Too little fluid or oil can result in catastrophe. Too much fluid or oil is also not a good thing. Don’t stress out, I’m going to make it easy for you. Here’s our complete L5P Duramax fluid capacity and specifications guide.

L5P Duramax Fluid Capacity

While our guide will give you the manufacturer’s recommended fluid capacity for the L5P Duramax, you always need to check your dipsticks and tank levels. Do not fill over the max line on a reservoir, tank, or dip stick. Add fluid or oil if you are at or below the fill or minimum mark. For more instructions on adding fluid or oil to your truck, see your L5P Duramax owner’s manual.

L5P Duramax Oil & Fluid Capacity

2017-2019 L5P Fluid Capacity

Oil/Fluid TypeCapacity – QuartsCapacity – Liters
Engine oil /w
Filter
10.0 Quarts9.5 Liters
Auto. Transmission
Fluid (Pan Removal
& Filter Replacement)
7.4 Quarts7.0 Liters
Transfer Case1.6 Quarts1.5 Liters
Coolant31.4 Quarts29.7 Liters
Front Differential
Fluid
UnknownUnknown
Rear Differential
Fluid
UnknownUnknown
DEF Tank7 Gallons26.5 Liters

2020+ L5P Duramax Fluid Capacity

Oil/FluidYearCapacity – QuartsCapacity – Liters
Engine Oil /w Filter2020+10.0 qt9.5 Liters
Auto Transmission
Fluid (Pan Removal
& Filter Change)
2020+7.4 qt7.0 Liters
Transfer Case
2020+2.4 qt2.3 Liters
Coolant2020+30.7 qt29.1 Liters
Low Temp. Circuit
Cooling System
2020+3.7 qt3.5 Liters
Front Differential
Fluid
2020+UnknownUnknown
Rear Differential
Fluid
2020+UnknownUnknown
DEF Tank
(Diesel Exhaust
Fluid)
2020+7 gallons or 28 qt26.5 Liters
Hydraulic Power
Steering Fluid
2020+2.1 qt2.0 Liters

L5P Duramax Fuel Capacity

2017-2020 Chevrolet & GMC HD Diesel

ModelFuel Tank Capacity (Gallons)
2500 & 3500 Crew Cab36 Gallons
2500 & 3500 Double Cab
Short Bed
29.4 Gallons
2500 & 3500 Double Cab
Long Bed
36 Gallons
Regular Cab28 Gallons

L5P Duramax Oil & Fluid Specifications

We recommend using only OEM or better quality fluids and filters for your L5P. It doesn’t make sense to cheap-out and use sub-par quality maintenance parts when you’ve spent over $40,000 buying the truck. Protect your investment! Use high quality oil and filters. If you’re looking for a list of filters or other L5P Maintenance Parts, check out our complete 6.6L L5P Duramax Maintenance Schedule & Parts list.

2017-2019 Duramax Oil & Fluids

Part TypePart #Amazon Link
Engine Oil15W40Shell Rotella T4 15W40
ACDelco 15W40
Shell Rotella T5 (blend ) 15W40
Shell Rotella T6 (Full Syn.) 15W40
CoolantDex-Cool
12346290
50/50 Mix
Dex-Cool 12346290
Hydraulic Power
Steering Fluid
GM
19329450
GM 19329450
Transmission Fluid
(6-Speed Automatic)
Dexron VI1 qt – Dexron VI
1 Gal – Dexron VI
Transfer Case FluidDexron VI1 qt – Dexron VI
1 Gal – Dexron VI
Front Differential
Fluid
75W-90ACDelco 75W90
Rear Differential Fluid75W-90 ACDelco 75W-90
Diesel Exhaust FluidN/APeak BlueDEF

2020+ Duramax Oil & Fluids

Part TypePart #Amazon Link
Engine Oil15W-40ACDelco 15W-40
Shell Rotella T4 15W-40
Shell Rotella T5 15W-40
CoolantDex-Cool
12346290
50/50 Mix
Dex-Cool 12346290
Transmission Fluid
(10-Speed Automatic)
Dexron ULVDexron ULV
Transfer Case FluidDexron VIDexron VI
Front Differential Fluidunknownunknown
Rear Differential Fluidunknownunknown
Diesel Exhaust FluidN/APeak BlueDEF

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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.