Top 10 Diesel Engine Oils
for June 2021

Recommendations are independently chosen by MOOZ’s editors. Purchases you make through our links may earn us a commission.

1
9.8
SCORE
Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Diesel Engine Oil 1 GA, Case of 3

Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Diesel Engine Oil 1 GA

Case of 3

by Valvoline
What We like

Outstanding oxidation resistance supports long oil life in heavy duty engines

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Product Features

  • The Only One endorsed and recommended by Cummins
  • Superior wear protection for hardworking heavy-duty trucks and equipment
  • Superior synthetic base stocks provide faster, safe starts during freezing weather and enhanced thermal properties for hot weather operations

Superior synthetic base stocks provide faster, safe starts during freezing weather and enhanced thermal properties for hot weather operations The only one endorsed and recommended by cummins Superior wear protection for hardworking heavy-duty trucks and equipment

2
9.6
SCORE
Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil (2.5 Gallon, Single Pack)

Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil (2.5 Gallon

Single Pack)

by Rotella
What We like

Provides outstanding protection for virtually all heavy duty diesel engines, including the latest emission controlled engines using EGR and containing a Diesel Particulate Filter

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Product Features

  • For best performance, follow the manufacturer's recommendations in your vehicle owners manual.
  • Meets or exceeds API CJ-4 requirements, and is designed to provide extra performance Shell Rotella T4 performs well in both older and new engines
  • Enhanced shear stability performance for viscosity control and optimal oil pressure in your engine
  • Formulated for enhanced deposit protection to help keep engines cleaner over the oil drain interval
  • Exclusive low ash formulation helps protect the exhaust catalysts and particulate filters found on the latest low emission vehicles

For best performance, follow the manufacturer's recommendations in your vehicle owners manual. Enhanced shear stability performance for viscosity control and optimal oil pressure in your engine Exclusive low ash formulation helps protect the exhaust catalysts and particulate filters found on the latest low emission vehicles Meets or exceeds api cj-4 requirements, and is designed to provide extra performance shell Rotella t4 performs well in both older and new engines Formulated for enhanced deposit protection to help keep engines cleaner over the oil drain interval

3
9.5
SCORE
Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of 3)

Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon

Case of 3)

by Rotella
What We like

Provides 1. 5% improved fuel economy performance compared to SAE 15W-40 oils

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Product Features

  • Triple Protection Plus formula combines fully synthetic base oils with advanced additives for excellent equipment protection and long engine life
  • For best performance, follow the manufacturer's recommendations in your vehicle owners manual.
  • Formulated with additive technology that protects against the effects of soot, dirt and other contaminants
  • Engineered with shear stability to resist viscosity loss and maintain optimal engine oil pressure

Engineered with shear stability to resist viscosity loss and maintain optimal engine oil pressure For best performance, follow the manufacturer's recommendations in your vehicle owners manual. 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

4
9.1
SCORE
Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3

Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA

Case of 3

by Valvoline
What We like

Outstanding oxidation resistance supports long oil life in heavy duty engines

more infoarrow_drop_down

Product Features

  • Superior wear protection for hardworking heavy-duty trucks and equipment
  • One Solution Technology suitable for a wide range of heavy-duty engines including diesel, gas and natural gas applications
  • The Only One endorsed and recommended by Cummins

Superior wear protection for hardworking heavy-duty trucks and equipment The only one endorsed and recommended by cummins One solution technology suitable for a wide range of heavy-duty engines including diesel, gas and natural gas applications

5
8.8
SCORE
AC Delco DexosD 0w-20 Light Duty Diesel Engine Oil 19370138, 10-9277 and AC Delco PF66, 55495105, 19391402 Oil Filter Oil Change Kit For 3.0l Duramax Diesel LM2

Dmax XD AC Delco DexosD 0w-20 Light Duty Diesel Engine Oil 19370138

10-9277 and AC Delco PF66, 55495105, 19391402 Oil Filter Oil Change Kit For 3.0l Duramax Diesel LM2

by Dmax XD
What We like

AC Delco Engine Oil Filter PF66

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Product Features

  • 7 Quarts AC Delco DexosD 0W-20 Light Duty Diesel Engine Oil 10-9277

7 quarts ac delco dexosd 0w-20 light duty diesel engine oil 10-9277

6
8.7
SCORE
Triax Fleet Supreme 5W-40 API CK-4 Full Synthetic Diesel Engine Oil, Friction Optimized and Boosted with Molybdenum & Nano-Boron, Superb Powerstroke Performance (5 Gallon Pail)

Triax Fleet Supreme 5W-40 API CK-4 Full Synthetic Diesel Engine Oil

Friction Optimized and Boosted with Molybdenum & Nano-Boron, Superb Powerstroke Performance (5 Gallon Pail)

by TRIAX Lubricants North America
What We like

OUTSTANDING POWER-STROKE PERFORMANCE Including 6.0 L turbo diesel: ELIMINATES STICTION AND INJECTOR ISSUES that plague Power-stroke engines - No need for additional additives - Contains state-of-the-art dispersal and ash control systems to keep your engine extremely clean.

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Product Features

  • Unique Additive Technology for UNSURPASSED WEAR PROTECTION, oxidation, and high temp stability. 60% lower wear than leading lubricants and standards. WIDE RANGE COMPATIBLE - Compatible with all heavy-duty diesel engines.
  • HIGHEST VISCOSITY INDEX any 5W-40 motor oil, of any brand, with exceptional stability and flow properties. Friction modified and VI stabilizer pre-boosted. Un-rivaled turbo-charger protection, will not create deposits and ash on turbo bearings (will not fry on the turbo). Up to 4% Fuel economy vs any 15W-40. COLD FLOW - Exceptional cold flow down to - 46 F.
  • EXTREME DRAIN CAPABILITIES: 25,000 mile drain interval for pickups and 80,000 for class 8 semi-trucks*
  • WHAT WILL YOU NOTICE THE FIRST TIME YOU SWITCH? - Dramatic reduction of engine noise. Improved fuel economy by at least 2%. Substantially longer drain intervals vs all other brands. Virtually no deposits on turbos. Significantly improved oil analysis results and engine durability.

Highest viscosity index any 5w-40 motor oil, of any brand, with exceptional stability and flow properties. friction modified and vi stabilizer pre-boosted. un-rivaled turbo-charger protection, will not create deposits and ash on turbo bearings (will not fry on the turbo). up to 4% fuel economy vs any 15w-40. cold flow - exceptional cold flow down to - 46 f. Extreme drain capabilities: 25,000 mile drain interval for pickups and 80,000 for class 8 semi-trucks* What will you notice the first time you switch? - dramatic reduction of engine noise. improved fuel economy by at least 2%. substantially longer drain intervals vs all other brands. virtually no deposits on turbos. significantly improved oil analysis results and engine durability. Unique additive technology for unsurpassed wear protection, oxidation, and high temp stability. 60% lower wear than leading lubricants and standards. wide range compatible - compatible with all heavy-duty diesel engines.

7
8.6
SCORE
Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil (1 Gallon, Case of 3)

Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil (1 Gallon

Case of 3)

by Rotella
What We like

Triple Protection Plus technology protects against wear, deposits and oil breakdown plus provides better low temperature flow compared to SAE 15W-40 oils

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Product Features

  • Delivers improved oxidation performance for increased resistance to breakdown under high temperatures compared to the previous formulation
  • Formulated to control engine wear, 37% better than the maximum wear requirements in API CK-4 engine wear tests
  • Helps control engine deposits for reliability at extended oil drain intervals
  • For best performance, follow the manufacturer's recommendations in your vehicle owners manual.
  • Heavy duty engine oil formulated with synthetic base oil components

Delivers improved oxidation performance for increased resistance to breakdown under high temperatures compared to the previous formulation Helps control engine deposits for reliability at extended oil drain intervals For best performance, follow the manufacturer's recommendations in your vehicle owners manual. Formulated to control engine wear, 37% better than the maximum wear requirements in api ck-4 engine wear tests Heavy duty engine oil formulated with synthetic base oil components

8
8.3
SCORE
Triax Fleet Supreme 15W-40 API CK-4 Full Synthetic Diesel Engine Oil, Friction Optimized and Boosted with Molybdenum and Nano-Boron, Superb Powerstroke Performance (5 Gallon Pail)

Triax Fleet Supreme 15W-40 API CK-4 Full Synthetic Diesel Engine Oil

Friction Optimized and Boosted with Molybdenum and Nano-Boron, Superb Powerstroke Performance (5 Gallon Pail)

by TRIAX LUBRICANTS
What We like

Eliminates the need to clean diesel particulate filters and is for use in virtually all diesel-powered pickups and heavy-duty trucks, both pre 2007 and post 2007 models fitted with emission control systems

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Product Features

  • CRP organic, metallic, Moly plating technology for unsurpassed wear protection, oxidation, and high temp stability
  • Contains state-of-the-art dispersal and ash control systems to keep your engine extremely clean
  • Friction modified and VI stabilizer pre-boosted; un-rivaled turbo-charger protection; will not create deposits and ash on turbo bearings (will not fry on the turbo)
  • Extreme drain intervals capabilities; 25,000-mile drain interval for pickups and 80,000 for class 8 semi-trucks

Extreme drain intervals capabilities; 25,000-mile drain interval for pickups and 80,000 for class 8 semi-trucks Friction modified and vi stabilizer pre-boosted; un-rivaled turbo-charger protection; will not create deposits and ash on turbo bearings (will not fry on the turbo) Contains state-of-the-art dispersal and ash control systems to keep your engine extremely clean Crp organic, metallic, moly plating technology for unsurpassed wear protection, oxidation, and high temp stability

9
8.3
SCORE
Shell Rotella T5 Synthetic Blend 10W-30 Diesel Engine Oil (1-Gallon, Case of 3)

Shell Rotella T5 Synthetic Blend 10W-30 Diesel Engine Oil (1-Gallon

Case of 3)

by Rotella
What We like

Provides excellent wear protection, which keeps engines running longer

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Product Features

  • Extended drain capabilities
  • For best performance, follow the manufacturer's recommendations in your vehicle owners manual.
  • Triple Protection Plus technology protects against wear, deposits and oil breakdown PLUS better fuel economy performance
  • Better cold cranking properties and better low temperature pumpability than conventional 15W-40, it reaches critical engine parts faster in colder temperatures to minimize wear and makes hard work easier in harsh climates
  • Fuel economy savings up to 1.6% compared to a conventional 15W-40, helping you stretch your budget and improve your bottom line

Extended drain capabilities Better cold cranking properties and better low temperature pumpability than conventional 15w-40, it reaches critical engine parts faster in colder temperatures to minimize wear and makes hard work easier in harsh climates For best performance, follow the manufacturer's recommendations in your vehicle owners manual. Fuel economy savings up to 1.6% compared to a conventional 15w-40, helping you stretch your budget and improve your bottom line Triple protection plus technology protects against wear, deposits and oil breakdown plus better fuel economy performance

10
8.3
SCORE
Shell ROTELLA 550019858-3PK T1 40 Heavy Duty Engine Diesel Oil - 1 Gallon Jug Pack of 3

Shell ROTELLA 550019858-3PK T1 40 Heavy Duty Engine Diesel Oil

1 Gallon Jug Pack of 3

by Shell Rotella
What We like

Rotella Heavy Duty, engine oil features multi-functional, low ash additive technology in a synthetic base oil designed to provide highly responsive protection that continuously adapts to your driving conditions.

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Product Features

  • Optimized dispersant content to help prevent engine sludge and varnish deposits
  • Conventional monograde motor oil for specialty vehicles such as tractors and buses
  • Excellent rust and corrosion protection for critical engine parts
  • Conventional monograde motor oil for specialty vehicles such as tractors and buses
  • Low ash content, minimizing formation of deposits and helping to keep intake ports clean

Outstanding oxidation resistance to help maximize service life Low ash content, minimizing formation of deposits and helping to keep intake ports clean Conventional monograde motor oil for specialty vehicles such as tractors and buses Outstanding oxidation resistance to help maximize service life Optimized dispersant content to help prevent engine sludge and varnish deposits Low ash content, minimizing formation of deposits and helping to keep intake ports clean Excellent rust and corrosion protection for critical engine parts Conventional monograde motor oil for specialty vehicles such as tractors and buses Excellent rust and corrosion protection for critical engine parts Optimized dispersant content to help prevent engine sludge and varnish deposits

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