10 Best Synthetic Oil For Diesel Engines of August 2025

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• 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

Shell Rotella T

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• 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
• Part Number: 550045347-3PK

Shell Rotella T

• “The Only One“ endorsed and recommended by Cummins
• Superior synthetic base stocks provide faster, safe starts during freezing weather and enhanced thermal properties for hot weather operations
• Outstanding oxidation resistance supports long oil life in heavy duty engines
• Superior wear protection for hardworking heavy-duty trucks and equipment

Valvoline

• Mobil 1 Turbo Diesel Truck is designed for modern diesel truck engines, delivering long drain capability, exceptional performance, and potential fuel economy benefits*
• Meets or exceeds the demanding specifications of major truck manufacturers - one engine oil can be used for mixed fleet operations
• Recommended for use in all super high-performance diesel applications, including low emission engines
• Helps engines last longer by reducing low-temperature sludge buildup and high-temperature deposits
• Exceptional low-temperature pumpability allows for easy engine start-up and helps to reduce wear

Mobil 1

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• 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 T

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.

Lucas Oil

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Advanced low-ash formulation helps control the blocking or poisoning of exhaust after treatment devices, helping maintain vehicle emission compliance and engine fuel efficiency.
• Synthetic base oil components provides the capability to improve cold starting and low temperature performance reduce fuel consumption
• The Advanced formulation delivers good engine cleanliness and protection against piston deposits ensuring engine and component reliability at extended oil drain intervals.
• Rotella T5 meets the requirements of the major US engine manufacturers for low emission applications.

Shell Rotella T

• Geniune OEM part

Ford

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• 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 colder temperatures to minimize wear and makes hard work easier in harsh climates
• Extended drain capabilities

Shell Rotella T

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
• Advanced low-ash formulation which helps control blocking of or poisoning of exhaust after treatment devices
• Rotella T5 use of synthetic base oil components provides the capability to improve cold starting and reduce fuel consumption and save money, without compromising engine protection or durability
• Rotella T5 advanced formulation delivers good engine cleanliness and protection against piston deposits ensuring engine and component reliability at extended oil drain intervals
• Shell Rotella T5 meets the requirements of the major US and European engine manufacturers for low emission applications

Shell Rotella T