10 Best Diesel Oils

After analyzing 554 products, scanning 4475 reviews, spending more than 36 hours of research and speaking with our test users, we think the Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon is the one of the Best Diesel Oil on the market.

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon – Best Overall Diesel Oil

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon
  • Provides 1.5% improved fuel economy performance compared to SAE 15W-40 oils
  • Triple Protection Plus formula combines fully synthetic base oils with advanced additives for excellent equipment protection and long engine life
  • 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
  • Suitable for diesel-powered vehicles from tractor/trailers to classic cars and heavy-duty diesel pickups that allow an SAE 5W-40

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

Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil
  • Triple Protection from wear, deposits and oil breakdown, this conventional Diesel Engine Oil provides exceptional wear protection for heavy duty engines for longer life
  • Formulated with advanced additive technology, which is engineered for superior engine cleanliness throughout the oil drain interval
  • Provides increased shear stability for better viscosity control and optimal engine oil pressure
  • Heightens emission control system durability and improves oil aeration
  • Provides enhanced protection against oil oxidation for more efficient operation

Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil – Best under $50

Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil
  • Triple Protection from wear, deposits and oil breakdown, this conventional Diesel Engine Oil provides exceptional wear protection for heavy duty engines for longer life
  • Formulated with advanced additive technology, which is engineered for superior engine cleanliness throughout the oil drain interval
  • Provides increased shear stability for better viscosity control and optimal engine oil pressure

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

Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil (1
  • Triple Protection Plus technology protects against wear, deposits and oil breakdown plus provides better low temperature flow compared to SAE 15W-40 oils
  • Helps control engine deposits for reliability at extended oil drain intervals
  • 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
  • Delivers improved oxidation performance for increased resistance to breakdown under high temperatures compared to the previous formulation

Delo 257004470 400 XLE SAE Synblend Synthetic Blend Oil 15W40 – Best Budget Diesel Oil

Delo 257004470 400 XLE SAE Synblend Synthetic Blend Oil 15W40
  • A premium synthetic blend, long drain  mixed-fleet engine oil specifically formulated for on- highway applications, including 2017 greenhouse gas (GHG 17) compliant diesel engines
  • Isosyn Advanced Technology: The Next Generation of Heavy Duty Engine Oil Chemistry - engineered to deliver longer oil life, better wear protection and longer engine life
  • Isoclean: Certified clean - ensure your lubricants meet OEM cleanliness requirements to help you minimize downtime, reduce maintenance costs and extend equipment life
  • Provides high performance piston deposit control and turbocharger protection due to its superb oxidation performance. Its high performing detergent and dispersant additives provide excellent diesel engine component protection.
  • Exceptional soot dispersancy and wear control - Cylinders, pistons, rings, and valve train components are well protected against wear and corrosion, providing optimum service life and minimal maintenance, contributing to maximum equipment utilization and minimal downtime.

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

Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil (1
  • Triple Protection Plus technology protects against wear, deposits and oil breakdown plus provides better low temperature flow compared to SAE 15W-40 oils
  • Helps control engine deposits for reliability at extended oil drain intervals
  • 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
  • Delivers improved oxidation performance for increased resistance to breakdown under high temperatures compared to the previous formulation

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon
  • Provides 1.5% improved fuel economy performance compared to SAE 15W-40 oils
  • Triple Protection Plus formula combines fully synthetic base oils with advanced additives for excellent equipment protection and long engine life
  • 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
  • Suitable for diesel-powered vehicles from tractor/trailers to classic cars and heavy-duty diesel pickups that allow an SAE 5W-40

Valvoline Premium Blue Extreme SAE 5W-40 Synthetic Engine Oil 1 – Premium Pick

Valvoline  Premium Blue  Extreme SAE 5W-40 Synthetic Engine Oil 1
  • Valvoline Premium Blue Engine oil is "The Only One" exclusively endorsed and recommended by Cummins
  • Superior synthetic base stocks provide faster, safe starts during freezing weather and enhanced thermal properties for hot weather operations
  • Enhanced protection against oil oxidation
  • Improved fuel economy potential over conventional 15W-40 oils
  • Excellent deposit protection. For any product or technical questions, please call 1-800-TEAM VAL

Delo 400 SDE SAE 15W-40 Motor Oil

Delo 400 SDE SAE 15W-40 Motor Oil
  • Premium quality, heavy duty motor oil manufactured in the USA
  • Formulated to meet the requirements of post-2007 low emission engines
  • Provides outstanding performance with ultra-low sulfur diesel and also with normal and low sulfur diesel fuels
  • May be used in older, conventional engines and gasoline engines
  • Formulated with ISOSYN technology
  • Reduced operating costs
  • Enhanced emission control system life
  • Reduced inventory costs
  • Warranty plus protection
  • 1 gallon

AmazonBasics Full Synthetic Motor Oil

AmazonBasics Full Synthetic Motor Oil
  • Full-synthetic motor oil (5W-40, 1 gallon) for heavy duty Diesel and Gasoline engines; improved fuel economy when compared to 15W-40 engine oils
  • Extended drain capable; superior high and low temperature protection including cold-weather startups
  • Helps prevent build up that can cause rust and corrosion; high resistance to viscosity and thermal breakdown
  • Helps to fight volatility burn-off to minimize engine deposits and exhaust emissions
  • CK-4/SN approved; always follow vehicle manual recommendations

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