Best Oil For 6.6 Duramax Diesel: image
Editor's Pick

Shell Rotella T6 5W-40 Full Synthetic Motor Oil, which is formulated with fully synthetic base oils, provides 1.5% improved fuel economy over conventional oils. The oil has been approved by the National Highway Traffic Safety Administration (NHTSA) for use in heavy-duty diesel engines. It also meets or exceeds the requirements of the following OEMs: Allison, Cummins, and MAN.

Value for Money

SynShield Durability Advantage 15w40 engine oil is formulated to provide maximum protection against wear, oxidation, soot contamination and aeration. The oil has been tested in the harshest operating conditions including high-temperature environments such as those found in heavy-duty diesel engines. It also meets or exceeds API CK-4 standards. The oil can be used for up to 10 years without changing its formulation. It is highly recommended for use in extreme temperatures. Notably, it was approved by the government in 2015.

Honorable Mention

Shell Rotella T4 Triple Protection 15W-40 engine oil provides superior wear protection for longer life and reduced fuel consumption. The oil has a low friction coefficient, which reduces the amount of friction between the piston and the oil. It also helps to prevent oil loss due to increased friction in the combustion process. Notably, diesel engines have been subjected to stricter emissions standards than those of petrol engines. Diesel engines are classified as heavy-duty and high-performance. However, it does not meet API requirements.

Best Oil For 6.6 Duramax Diesel

Top 8 Best Oil For 6.6 Duramax Diesel

Top Pick
1
Why we chose it
  • Country Of Origin : United States
  • Formulated With Additive Technology That Protects Against The Effects Of Soot, Dirt And Other Contaminants
  • Triple Protection Plus Formula Combines Fully Synthetic Base Oils With Advanced Additives For Excellent Equipment Protection And Long Engine Life
  • Provides 1.5% Improved Fuel Economy Performance Compared To Sae 15W-40 Oils
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3): image
98%
customers recommend this product
4.9/ 5
Longevity4.8
Mileage4.8
Value for money4.7
Sheerness4.6
2

Delo 222290470 400 SDE SAE 15W-40 Motor Oil – 1 Gallon Jug

249 ratings | 2 offers | 249 Reviews
Price: $40.28$52.72
Why we chose it
  • Fit Type: Universal Fit
Delo 222290470 400 SDE SAE 15W-40 Motor Oil - 1 Gallon Jug: image
94%
customers recommend this product
4.7/ 5
Value for money4.6
Mileage4.6
3
Why we chose it
  • RESIST OIL BREAKDOWN with superior antioxidants that guard against oil-degrading oxygen, keeping oil working longer and extending the life of your engine
  • MINIMIZE EXPENSIVE REPAIRS by safeguarding vital engine components from exhaust system damage
  • PROVEN TO MINIMIZE WEAR with enhanced anti-wear additives that form an extra layer of defense between your engine s critical moving parts
  • FIGHT SLUDGE & DEPOSITS with our advanced detergent system that keeps cylinder walls and moving parts in your engine clean
  • PROVIDE EXCEPTIONAL TEMPERATURE PROTECTION by retaining a greater degree of viscosity no matter the climate or driving conditions
Valvoline 5W-40 MST SynPower Full Synthetic Motor Oil - 1qt (Case of 6) (VV966-6PK): image
94%
customers recommend this product
4.7/ 5
Longevity4.5
Sheerness4.5
Mileage4.4
Value for money4.3
4
Why we chose it
  • Maintains fuel economy without sacrificing engine durability.
  • Keep-clean performance: superior soot busting, deposit-dispersing capability.
  • Superior cold weather startability and operating characteristics.
  • Oil strength: withstands higher heat range than conventional oils.
  • Friction modified with Micron Moly and Penetro
Schaeffer Manufacturing Co. 9000CK4-006S SynShield OTR Plus Full Synthetic Diesel Engine Oil 5W-40, 1-Gallon Bottle: image
96%
customers recommend this product
4.8/ 5
Mileage4.6
Value for money4.4
5
Why we chose it
  • Includes correct amount of RAVENOL Motor Oil, Oil Filter and Hardware for your vehicle (see the product image)
  • RAVENOL has formal Factory Approval or Meets your vehicle manufactures specific oil specification
  • Unique oil formulation that is engineered for extended long life oil change intervals
  • Improve fuel mileage, reduce engine emissions and extend engine life with CleanSynto technology from Germany
  • Please see Product description regarding the California Proposition 65 Warning
Blau J1A2764-A Motor Oil Change Kit - Compatible with 2001-17 Chevrolet Silverado w/ 8 Cylinder 6.6L Duramax Diesel Engine - 15w40: image
50%
customers recommend this product
3/ 5
6
Why we chose it
  • Includes correct amount of RAVENOL Motor Oil, Oil Filter and Hardware for your vehicle (see the product image)
  • Improve fuel mileage, reduce engine emissions and extend engine life with CleanSynto technology from Germany
  • RAVENOL has formal Factory Approval or Meets your vehicle manufactures specific oil specification
  • Please see Product description regarding the California Proposition 65 Warning
  • Unique oil formulation that is engineered for extended long life oil change intervals
Blau J1A2764-C Motor Oil Change Kit - Compatible with 2001-17 GMC Sierra w/ 8 Cylinder 6.6L Duramax Diesel Engine - 15w40: image
100%
customers recommend this product
5/ 5
7
Why we chose it
  • Wear control helps keep moving metal engine surfaces apart for a longer life
  • Increased shear stability for better viscosity control and optimal engine oil pressure
  • Meets or exceeds API CK-4 requirements and is designed to provide extra performance in both older and new engines
  • Formulated with advanced additive technology for enhanced deposit control and superior engine cleanliness throughout the oil drain interval
  • Single 2.5-gallon bottle with ergonomic design for easy handling and pouring
  • Conventional 15W-40 diesel engine oil with Triple Protection technology protects against wear, deposits, and oil breakdown
  • Exceptional wear protection for longer life in a wide range of heavy-duty engine applications from diesel pickup trucks to tractors to tractor trailers
  • Enhanced protection against oil oxidation for more efficient operation
Shell Rotella T Triple Protection Conventional 15W-40 Diesel Engine Oil (2.5 Gallon, Single Pack),Amber: image
96%
customers recommend this product
4.8/ 5
Mileage4.6
Value for money4.4
Longevity4.4
8
Why we chose it
  • Excellent wear protection during severe operating conditions
  • Friction modified with micron moly and penetrate
  • Better contamination control with superior soot-busting, deposit-dispersing capability
  • Oil durability: strong oxidation and viscosity control with less oil consumption
  • Strong stay-in-grade performance throughout the life of the oil
Schaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil, 12-Quart Bottle (Pack of 12): image
96%
customers recommend this product
4.8/ 5
Mileage4.4
Value for money4.3
Top Pick
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)
Shell Rotella T6 5W-40 diesel engine oil is a full synthetic motor oil that features exclusive Triple Protection Plus technology, formulated with fully synthetic base oils plus advanced additives to protect against wear, deposits, and oil breakdown. It also provides better low temperature flow and increased fuel economy performance, without compromising durability, compared to conventional SAE 15W-40 oils. Shell Rotella T6 5W-40 Full Synthetic motor oil is suitable for virtually all modern low-emission heavy duty engines and older hard working diesel engines (consult your owner's manual for heavy duty engine oil recommendations). With its wide range of specifications and approvals from many of the world's leading engine makers, it is an excellent choice for on-highway fleets, general haul, construction, agriculture, public-transport operators, and diesel pick-up trucks. Exceeds the requirements of the following industry specifications: API: CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4; ACEA E9. Meets or exceeds the following OEM requirements: Allison TES 439; Caterpillar ECF-2/ECF-3; Cummins CES 20086, 20081; Detroit Fluid Specification (DFS) 93K222, 93K218; Ford WSS-M2C171-F1; JASO DH-2, JASO MA/MA2; MAN M3575; MACK EOS-4.5; MB-Approval 228.31; Volvo VDS-4.5, 4.
Ranking the Brands
Shell Rotella: 25.00%
Chevron: 12.50%
Valvoline: 12.50%
Schaeffer Manufacturing Co: 25.00%
Blau: 25.00%

Comparison Table

Сomparison: Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3): imageСomparison: Delo 222290470 400 SDE SAE 15W-40 Motor Oil - 1 Gallon Jug: imageСomparison: Valvoline 5W-40 MST SynPower Full Synthetic Motor Oil - 1qt (Case of 6) (VV966-6PK): imageСomparison: Schaeffer Manufacturing Co. 9000CK4-006S SynShield OTR Plus Full Synthetic Diesel Engine Oil 5W-40, 1-Gallon Bottle: imageСomparison: Blau J1A2764-A Motor Oil Change Kit - Compatible with 2001-17 Chevrolet Silverado w/ 8 Cylinder 6.6L Duramax Diesel Engine - 15w40: imageСomparison: Blau J1A2764-C Motor Oil Change Kit - Compatible with 2001-17 GMC Sierra w/ 8 Cylinder 6.6L Duramax Diesel Engine - 15w40: imageСomparison: Shell Rotella T Triple Protection Conventional 15W-40 Diesel Engine Oil (2.5 Gallon, Single Pack),Amber: imageСomparison: Schaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil, 12-Quart Bottle (Pack of 12): image
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)Delo 222290470 400 SDE SAE 15W-40 Motor Oil – 1 Gallon JugValvoline 5W-40 MST SynPower Full Synthetic Motor Oil – 1qt (Case of 6) (VV966-6PK)Schaeffer Manufacturing Co. 9000CK4-006S SynShield OTR Plus Full Synthetic Diesel Engine Oil 5W-40, 1-Gallon BottleBlau J1A2764-A Motor Oil Change Kit – Compatible with 2001-17 Chevrolet Silverado w/ 8 Cylinder 6.6L Duramax Diesel Engine – 15w40Blau J1A2764-C Motor Oil Change Kit – Compatible with 2001-17 GMC Sierra w/ 8 Cylinder 6.6L Duramax Diesel Engine – 15w40Shell Rotella T Triple Protection Conventional 15W-40 Diesel Engine Oil (2.5 Gallon, Single Pack),AmberSchaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil, 12-Quart Bottle (Pack of 12)
Package InformationBottleJugBottleBottleBottleBottle
Viscosity5w-4015w-405w-405w-4015W4015W4015w-4015w-40
BrandShell RotellaChevronValvolineSchaeffer Manufacturing CoBlauBlauShell RotellaSchaeffer Manufacturing Co
Vehicle Service TypeCarCarTruck
Liquid Volume128 Fluid Ounces1 Gallons6 Quarts128 Fluid Ounces320 Fluid Ounces12288 Fluid Ounces
ManufacturerRotellaDeloValvolineBLAUBLAURotella
Item Weight23.5 pounds3 pounds11.5 pounds20 pounds20 pounds18 pounds
Is Discontinued By ManufacturerNoNoNoNoNo
Product Dimensions12.1 x 7.8 x 4.1 inches13.13 x 5.75 x 9.25 inches12 x 12 x 15 inches12 x 12 x 15 inches14.5 x 9.25 x 15.25 inches
Size1 QT, Case of 61 Gallon2.5 Gallon1 Quart (Pack of 12)

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