Best diesel motor oil – Top 8 of 2019

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We read thousands reviews, and put together a list of the best sellers. Check out the top diesel motor oil below.


No. 1
Rotella T6 Synthetic Diesel Motor Oil 5W-40 CJ-4, 1 Gallon - Pack of 3
  • 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...
  • 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
No. 2
Rotella T5 Synthetic Blend Diesel Motor Oil, 15W-40 CK-4, 1 Gallon - Pack of 3
  • Triple Protection Plus technology protects against wear, deposits and oil breakdown plus provides better low temperature flow compared to...
  • 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
No. 3
Valvoline 5W-40 Premium Blue Extreme Synthetic Diesel Engine Oil - 1gal (Case of 3) (774038-3PK)
  • 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...
  • 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
SaleNo. 4
Rotella T4 Triple Protection Diesel Motor Oil 15W-40 CK-4, 2.5 Gallon - Pack of 1
  • Triple Protection from wear, deposits and oil breakdown, this conventional Diesel Engine Oil provides exceptional wear protection for heavy...
  • 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
SaleNo. 5
Rotella T4 Triple Protection Diesel Motor Oil 15W-40 CK-4, 5 Gallon - Pack of 1
  • Triple Protection from wear, deposits and oil breakdown, this conventional Diesel Engine Oil provides exceptional wear protection for heavy...
  • 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
No. 6
Royal Purple 04154 / 300905 Duralec Super 15W40 CK-4 Motor Oil Synthetic - 1 gal. (Case of 3)
  • Better wear protection
  • Increased fuel efficiency
  • Better protection of the expensive catalytic emission system
  • Improved compatibility with fuels containing ethanol
No. 7
Rotella T5 Synthetic Blend Diesel Motor Oil 10W-30, 1 Gallon - Pack of 1
  • Triple Protection Plus technology protects against wear, deposits and oil breakdown PLUS better fuel economy performance
  • Fuel economy savings up to 1.6% compared to a conventional 15W-40, helping you stretch your budget and improve your bottom line
  • Provides excellent wear protection, which keeps engines running longer
  • Better cold cranking properties and better low temperature pumpability than conventional 15W-40, it reaches critical engine parts faster in...
  • Extended drain capabilities
No. 8
Delo 257004470 400 XLE SAE Synblend Synthetic Blend Oil 15W40, 1 Gallon, 1. gallons
  • A premium synthetic blend, long drain  mixed-fleet engine oil specifically formulated for on- highway applications, including 2017...
  • Isosyn Advanced Technology: The Next Generation of Heavy Duty Engine Oil Chemistry - engineered to deliver longer oil life, better wear...
  • Isoclean: Certified clean - ensure your lubricants meet OEM cleanliness requirements to help you minimize downtime, reduce maintenance costs...
  • Provides high performance piston deposit control and turbocharger protection due to its superb oxidation performance. Its high performing...
  • Exceptional soot dispersancy and wear control - Cylinders, pistons, rings, and valve train components are well protected against wear and...