Top 9 15W-40 Synthetic Oil – Motor Oils

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1. Shell Rotella

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Case of 3, Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil 1-Gallon

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Shell Rotella #ad - Enhanced fuel economy capability of 1. 5 percent without compromising engine protection or durability compared to 15W-40 oils. Multi-functional dispersant additives provide an enhanced level of protection against the effects of soot, dirt, and other contaminants compared to previous formulation.

Better cold-cranking properties and low-temperature pumpability for reaching critical engine parts faster. Exceptional wear protection for longer life in a wide range of heavy-duty engine applications — from pickup trucks to tractors to semi rigs. Full synthetic 15w-40 diesel engine oil with Triple Protection Plus technology protects against wear, oil breakdown, deposits, and improves low-temperature flow.

Advanced low ash formulation helps protect the exhaust catalysts and particulate filters found on the latest low-emission vehicles. Case of three 1-gallon bottles with ergonomic design for easy handling and pouring. Increased shear stability for better viscosity control and optimal engine oil pressure.
BrandShell Rotella #ad
ManufacturerRotella #ad
Part Number550050467
Model550050467-3PK
WarrantyLimited

2. Valvoline

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Case of 3, Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA

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Valvoline #ad - Outstanding wear protection. Valvoline premium blue Engine oil is The Only One exclusively endorsed and recommended by Cummins. Strong shear stability provides stay-in-grade performance. Superior deposit protection compared to industry requirements.
BrandValvoline #ad
ManufacturerValvoline #ad
Height11.44 Inches
Length14.5 Inches
Weight24 Pounds
Width9.13 Inches
Part Number773780
Model773780

3. Shell Rotella

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Case of 3, Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil 1-Gallon

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Shell Rotella #ad - Synthetic blend 15w-40 diesel engine oil with Triple Protection Plus technology protects against wear, deposits, and oil breakdown. Improved oxidation performance for increased resistance to oil breakdown under high temperatures compared to the previous formulation.

Ideal for on-highway fleets, construction, and agricultural machinery, and diesel pickup trucks — including high-power vehicles that require resistance to heat and stress. Improves low-temperature flow compared to conventional 15W-40 oils. Case of three 1-gallon bottles with ergonomic design for easy handling and pouring. Controls engine wear 37 percent better than the maximum wear requirements in API CK-4 engine wear tests. Helps control engine deposits for reliability at extended oil drain intervals always follow the OEM recommended oil drain interval.
BrandShell Rotella #ad
ManufacturerShell Rotella #ad
Weight24 Pounds
Part Number550045348-3PK
Model550045348-3PK
WarrantySee manufacturer's label

4. Cummins

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1 Quart, Cummins 3265336 Onan SAE 15W-40 Oil

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Cummins #ad - Fit type: Universal. Reduces consumption and engine wear. Factory tested oil. 32 oz. Provides maximum protection for engines.
BrandCummins #ad
ManufacturerCummins/Onan #ad
Height2.75 Inches
Length9 Inches
Weight1 Pounds
Width4.25 Inches
Part Number3265336
Model3265336

5. Royal Purple

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5 gal., Royal Purple 05154 API-Licensed SAE 15W-40 High Performance Synthetic Motor Oil

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Royal Purple #ad - Improved compatibility with fuels containing ethanol. Better wear protection. Increased fuel efficiency. Better protection of the expensive catalytic emission system.
BrandRoyal Purple #ad
ManufacturerRoyal Purple #ad
Height14.75 Inches
Length10.5 Inches
Weight18 Pounds
Width9.75 Inches
Part Number05154
Model5154
WarrantyN

6. Shell Rotella

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Single Pack, Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil 1-Gallon

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Shell Rotella #ad - Advanced low ash formulation helps protect the exhaust catalysts and particulate filters found on the latest low-emission vehicles. Increased shear stability for better viscosity control and optimal engine oil pressure.

Enhanced fuel economy capability of 1. 5 percent without compromising engine protection or durability compared to 15W-40 oils. Multi-functional dispersant additives provide an enhanced level of protection against the effects of soot, dirt, and other contaminants compared to previous formulation. Single 1-gallon bottle with ergonomic design for easy handling and pouring. Exceptional wear protection for longer life in a wide range of heavy-duty engine applications — from pickup trucks to tractors to semi rigs.

Full synthetic 15w-40 diesel engine oil with Triple Protection Plus technology protects against wear, oil breakdown, deposits, and improves low-temperature flow. Better cold-cranking properties and low-temperature pumpability for reaching critical engine parts faster.
BrandShell Rotella #ad
ManufacturerRotella #ad
Part Number550050467-5Q
Model550050467-5Q
WarrantyLimited

7. Lucas Oil

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1 Gallon, Lucas Oil 10299 SAE 15W-40 CJ-4 Synthetic Motor Oil

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Lucas Oil #ad - Package dimensions: 8. 38 l x 12 h x 3. 5 w inches. Package weight : 7. 8 pounds. Fit type: Vehicle Specific. Country of Origin : United States.
BrandLucas Oil #ad
ManufacturerLucas Oil #ad
Height12 Inches
Length8.37 Inches
Weight7.58 Pounds
Width3.5 Inches
Part Number10299
Model10299
WarrantyLimited Manufacturer

8. Schaeffer Manufacturing Co

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Schaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil, 12-Quart Bottle Pack of 12

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Schaeffer Manufacturing Co #ad - Oil durability: strong oxidation and viscosity control with less oil consumption. Better contamination control with superior soot-busting, deposit-dispersing capability. Excellent wear protection during severe operating conditions. Strong stay-in-grade performance throughout the life of the oil. Friction modified with micron moly and penetrate.
BrandSchaeffer Manufacturing Co #ad
ManufacturerSchaeffer Manufacturing Co. #ad
Part Number0700CK4-012
Model0700CK4-012
WarrantyCheck with manufacturer.

9. Shell Rotella

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Shell Rotella 15W40 Motor Oil Gallon

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Shell Rotella #ad - Superior engine cleanliness for a cleaner engine throughout oil drain interval. Exceptional wear protection for longer engine life. Protects under the most severe engine conditions found in modern low-emission engines and older hard working diesel engines. Enhanced protection against oxidation for more efficient operation. Increased shear stability for better viscosity control and optimal oil pressure.
BrandShell Rotella #ad
ManufacturerValvoline Oil Co. #ad
Part NumberOIL50012