Best Diesel Engine Oils 2024 | Comprehensive Review
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Best Diesel Engine Oils 2024

Which engine oil is best for diesel car

Which engine oil is best for diesel car ? As the demands on diesel engines continue to evolve, selecting the right engine oil has never been more crucial. Our comprehensive guide to the best diesel engine oils for 2024 provides in-depth reviews of top-performing brands, offering insights into their performance, durability, and value. From synthetic blends to full synthetics, our expert recommendations will help you choose the perfect oil to enhance engine efficiency and extend its life.

#1 Shell Rotella T6 Full Synthetic 5W-40

Shell Rotella T6 Full Synthetic 5W-40
engine oil for diesel car

When it comes to keeping your diesel engine running smoothly and efficiently, Shell Rotella T6 5W-40 Full Synthetic Diesel Engine Oil is a game changer. I’ve used this oil in everything from my old reliable farm tractor to my sleek new semi, and the results have been nothing short of impressive.

Why We Recommend Shell Rotella T6:

  • Superior Wear Protection: After switching to Rotella T6, the difference in engine smoothness and noise reduction was noticeable. The engine runs like it鈥檚 just out of the shop, which says a lot about the oil鈥檚 wear protection capabilities.
  • Boost in Fuel Efficiency: As someone who keeps a tight watch on fuel costs, I appreciate the up to 1.5% improvement in fuel economy. It might not sound like a lot, but it adds up, especially when you’re clocking thousands of miles a month.
  • Cold Starts No Longer a Cold Sweat: The enhanced low-temperature flow means that even on frosty mornings, I don鈥檛 have to cross my fingers when turning the ignition. The oil flows smoothly, helping the engine to start up without the usual groan.
  • Keeps the Engine Clean: The advanced dispersant additives in this oil do an excellent job at keeping soot and dirt at bay, which is essential for maintaining engine health and performance, especially under heavy loads.
  • Reliable Performance Across Applications: Whether you鈥檙e hauling heavy loads across states or using heavy machinery for farm work, this oil stands up to the challenge, maintaining optimal pressure and viscosity, even under tough conditions.

#2 Shell Rotella T4 Triple Protection Conventional 15W-40

Shell Rotella T4 Triple Protection Conventional 15W-40

Shell Rotella T4 Triple Protection 15W-40 is a heavy-duty diesel engine oil designed to offer advanced wear protection, deposit control, and oil stability. Suitable for both modern low-emission engines and older models, this oil is engineered to maintain high performance in a diverse range of operating conditions.

Performance and Protection:

The oil is formulated with enhanced additive technology that provides superior deposit control which helps keep engines running clean and efficient. Its low-ash content ensures compatibility with modern exhaust emissions control systems, protecting diesel particulate filters against blockage.

Viscosity and Efficiency:

Shell Rotella T4 demonstrates excellent viscosity control even under severe mechanical stress, maintaining optimal oil pressure and reducing engine wear. Additionally, its ability to resist breakdown under high temperatures contributes to prolonged oil life and extended drain intervals.

Fuel Economy:

While primarily focused on protection and performance, using Shell Rotella T4 can also contribute to improved fuel efficiency compared to conventional 15W-40 motor oils, although the primary focus remains on engine protection and longevity.

Specifications and Approvals:

  • Meets or exceeds API CJ-4, CI-4 Plus, CI-4, CH-4, ACEA E9
  • Compatible with OEM requirements like Caterpillar ECF-2/3, Cummins CES 20081, and Ford WSS-M2C171-F1


Ideal for operators in the construction, agriculture, and transport sectors, as well as for general haulage and diesel pickup trucks. It supports engines requiring a robust oil capable of handling extended service in tough conditions.

Check Out Our Fresh Video Reviews !

#3 AC Delco DexosD 0w-20 Engine Oil

AC Delco DexosD 0w-20 Engine Oil

For vehicle owners who prioritize engine health and efficiency, the Synthetic Motor Oil 0W-20 paired with the PF66 filter offers an excellent maintenance solution. This kit is designed specifically to cater to the needs of modern engines, particularly those that are turbocharged.

The synthetic formulation of the 0W-20 oil is engineered to exceed ILSAC GF-5 and API service classification standards, offering superior protection against wear. This is crucial for maintaining engine integrity and longevity, especially under high-performance demands.

Enhanced Deposit Control:

This oil goes beyond the stringent requirements of ILSAC GF-5/API standards in preventing deposit formation. By doing so, it ensures that engines, especially those that are turbocharged, operate at peak efficiency without the complications of sludge and deposit buildup.

Protection Against Low-Speed Pre-Ignition (LSPI):

Low-speed pre-ignition is a common issue in turbocharged engines that can cause severe engine damage. The oil’s advanced formula is specifically designed to minimize the risk of LSPI, ensuring that the engine runs smoothly even under variable speed conditions.

Improved Fuel Efficiency:

Meeting ILSAC GF-5 specifications, the oil helps fulfill current energy-conserving performance standards. By reducing internal engine friction, it promotes better fuel economy, which is beneficial for both the environment and your wallet.

OEM Approvals and Compliance:

The oil meets GM dexosD specifications, indicating it is approved for use in General Motors vehicles requiring this specific grade and type. This compliance ensures that using this oil will not affect vehicle warranties.

#4 Shell Rotella T5 Synthetic Blend 15W-40

Shell Rotella T5 Synthetic Blend 15W-40
best engine oil for diesel car

Shell Rotella T5 15W-40 is a synthetic blend diesel engine oil that leverages advanced Triple Protection Plus technology, incorporating synthetic base oils with enhanced additive technology to provide optimal engine performance. Designed to exceed the stringent requirements set by CK-4 specifications, this oil offers a blend of performance and protection suited for a variety of heavy-duty applications.

Enhanced Wear Protection:

Shell Rotella T5 offers superior wear protection, achieving on average 37% better than the strictest wear requirements as per API CK-4 test results. This exceptional protection helps extend the engine’s lifespan and is particularly beneficial in high-power vehicles where resistance to heat and stress is crucial.

Improved Low-Temperature Flow:

The synthetic blend formulation enhances low-temperature flow, making cold starts easier and more reliable. This characteristic is especially valuable in harsh weather conditions, ensuring consistent engine protection and performance year-round.

Viscosity Control: This oil maintains effective viscosity control under high temperature, safeguarding the engine during extended operation periods and under varying environmental conditions. This stability is essential for keeping the engine running smoothly and efficiently.

Low-Ash Formulation:

The advanced low-ash content is critical in minimizing the blockage or poisoning of exhaust after-treatment devices. This helps maintain vehicle emission compliance and engine fuel efficiency, supporting overall environmental stewardship.

Fuel Efficiency:

By improving cold starting and low-temperature performance, the synthetic base oil components in Rotella T5 help reduce overall fuel consumption. This efficiency does not compromise the oil鈥檚 protective capabilities, making it a cost-effective choice for fleet operations and personal vehicles alike.

Engine Cleanliness:

Shell Rotella T5’s formulation delivers excellent engine cleanliness and protection against piston deposits, which ensures engine and component reliability. This cleanliness supports extended oil drain intervals, reducing maintenance frequency and costs.

#5 Valvoline Premium Blue Extreme SAE

Valvoline Premium Blue Extreme SAE

As we look ahead to the best diesel engine oils of 2024, Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Engine Oil stands out for its exceptional performance under extreme conditions. Designed specifically for heavy-duty diesel and gasoline engines operating in varying temperatures, this oil not only enhances engine performance but also ensures significant protection and efficiency.

Key Attributes and Advantages:

One of the primary concerns for any diesel engine is the wear on its internal moving parts. Valvoline Premium Blue Extreme offers superior wear protection, making it a top choice for heavy-duty applications where engine stress is a constant.

Oxidation Resistance and Deposit Control:

This oil combats oxidation and prevents the accumulation of deposits and sludge with its superior synthetic base oils and specialized inhibitors. Such qualities are crucial for maintaining engine cleanliness and function, particularly in modern engines with stringent emission requirements.

Cold Start Reliability and Soot Management:

Valvoline鈥檚 formula is engineered to provide reliable protection during cold starts, which is vital for engines that experience regular idle periods. It also manages soot levels effectively, protecting against the build-up that can degrade engine performance over time.

Enhanced Fuel Economy:

Among the best diesel engine oils of 2024, Valvoline Premium Blue Extreme stands out for its ability to improve fuel economy by up to 1.5% compared to traditional 15W-40 oils. This advancement in fuel efficiency is particularly beneficial for on-highway operations, translating into cost savings and environmental benefits.

Extended Drain Intervals:

A distinctive feature of Valvoline Premium Blue Extreme is its capacity to extend oil drain intervals up to 5,000 miles in Cummins X15/X12 engines when the average fuel consumption is 7mpg or higher. This capability allows for fewer oil changes, reducing maintenance time and costs.

#6 Schaeffer Manufacturing Co. 0700CK4-006S

Schaeffer Manufacturing Co. 0700CK4-006S

As diesel engines continue to evolve, so does the demand for engine oils that can meet and exceed rigorous standards. Schaeffer’s SynShield Durability Advantage 15w40 is a synthetic plus, heavy-duty diesel engine oil that promises top-tier performance, particularly in severe operating conditions. It鈥檚 engineered to protect against wear, oxidation, deposits, soot contamination, and aeration.

Enhanced Wear Protection:

Schaeffer鈥檚 SynShield 15w40 uses proprietary friction modifiers, Micron Moly and Penetro, which create a robust, slippery film on metal surfaces. This protective layer is crucial in preventing metal-to-metal contact, thereby significantly reducing wear on critical engine components such as bearings, rings, pistons, cylinders, and valve trains.

Advanced Oxidation and Viscosity Control:

This oil demonstrates strong oxidation resistance and viscosity control, which translates to less oil consumption over time. Such features are vital for maintaining engine efficiency and longevity, especially under harsh operating conditions.

Superior Contamination Control:

With its superior soot-busting and deposit-dispersing capabilities, SynShield Durability Advantage 15w40 excels in keeping engines clean. This is particularly important for engines that operate with heavy exhaust gas recirculation (EGR) and utilize complex exhaust after-treatment devices like diesel particulate filters (DPFs) and selective catalytic reduction (SCR) systems.

Stay-in-Grade Performance:

Schaeffer鈥檚 15w40 maintains its performance characteristics throughout the life of the oil, ensuring consistent protection and engine response even under extreme duty cycles.

Emission Compliance:

Suitable for use in 2007 and 2010 emission-compliant engines, this oil supports modern environmental standards without sacrificing engine protection or performance. Its formulation is designed to work seamlessly with the latest exhaust after-treatment technologies.

API Specifications:

The oil meets and surpasses API CK-4 specifications, confirming its ability to perform under the most demanding conditions and its compatibility with a broad range of engine types.

#7 Mobil 1 Turbo Diesel Truck Full Synthetic Motor Oil 5W-40

Mobil 1 Turbo Diesel Truck 5W-40 is a fully synthetic heavy-duty diesel motor oil designed to cater to the rigorous demands of modern diesel engines in severe operating conditions. Engineered with state-of-the-art technology, this oil offers not only extended engine life and long drain capabilities but also potential fuel economy benefits. It is recommended for a broad spectrum of applications across various industries, including on-road transport and off-road mining, construction, and agriculture.

Advanced Engine Protection:

Mobil 1 Turbo Diesel Truck 5W-40 utilizes advanced synthetic formulations that help extend engine life by reducing wear and maintaining cleanliness. It is equipped to handle high-performance requirements, including those of modern low emission engines that feature technologies such as Exhaust Gas Recirculation (EGR).

Temperature Stability:

This oil provides excellent thermal and oxidative stability, which helps to prevent deposits at high temperatures and sludge buildup at low temperatures. Such characteristics are crucial for maintaining engine efficiency and operation under severe conditions.

Enhanced Low-Temperature Performance:

Exceptional low-temperature pumpability makes cold starts easier and reduces wear, an essential feature for engines operating in cold environments or those that experience frequent start-stop cycles.

Versatility in Application:

Recommended for use in everything from turbo diesel pick-up trucks to the demanding environments of heavy-duty on-road and off-road applications. Mobil 1 Turbo Diesel Truck 5W-40’s versatility makes it suitable for a wide range of light-duty and heavy-duty applications, enabling uniform usage across mixed fleet operations.

Fuel Economy Benefits:

While providing robust protection and performance, this motor oil also offers potential fuel economy improvements, helping operators save on fuel costs and reduce environmental impact.

Specifications and OEM Compatibility:

Mobil 1 Turbo Diesel Truck 5W-40 meets or exceeds the tough specifications set by major truck manufacturers, ensuring compliance and versatility in mixed fleet operations. It is perfectly suited for high-performance diesel applications, including those with stringent low emission requirements.


Can You Put Diesel Oil in a Petrol Car?

It’s generally not recommended to put diesel oil in a petrol car. Diesel oil is formulated differently than petrol oil, designed to handle the higher soot levels and different combustion characteristics of diesel engines. While diesel oil might not immediately harm a petrol engine, it can lead to increased engine wear over time and potentially damage emission control systems. Always use the oil type specified by your vehicle’s manufacturer for optimal performance and longevity.

How Often to Change Oil in a Diesel Car?

The frequency of oil changes in a diesel car can vary based on the make and model of the vehicle, as well as driving conditions. However, a common recommendation is to change the oil every 7,500 to 10,000 miles or every six months, whichever comes first. Always refer to your vehicle’s owner manual for the manufacturer’s specific guidelines. Regular oil changes are crucial for maintaining engine health and efficiency in diesel vehicles.

Can I Use Cooking Oil in My Diesel Car?

Using cooking oil in a diesel car is not advisable. While some older diesel engines can run on vegetable oil or biodiesel (a refined form of vegetable oil), using straight cooking oil without proper processing can lead to significant engine damage. Cooking oil is too thick and can clog fuel injectors and damage the fuel system. Additionally, it can cause incomplete combustion, leading to increased emissions and engine deposits. If you’re interested in alternative fuels, consider using commercially available biodiesel that meets quality standards.

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