Best Diesel Motor Oils of 2025

Shell Rotella T4 Diesel Engine Oil is a high-quality 15W-40 motor oil designed to provide exceptional protection for diesel engines. With its advanced Triple Protection technology, this oil safeguards your engine against wear, deposits, and oil breakdown. Its advanced additive technology ensures superior engine cleanliness and enhanced deposit control throughout the oil drain interval. The oil's increased shear stability ensures better viscosity control and optimal engine oil pressure. Additionally, it offers enhanced protection against oil oxidation, resulting in more efficient operation. With its exceptional wear protection, Shell Rotella T4 Diesel Engine Oil prolongs the life of your engine, making it suitable for a wide range of heavy-duty engine applications, from diesel pickup trucks to tractors to tractor trailers.

Chevron Delo 400 Oil is a premium synthetic blend designed specifically for heavy-duty diesel engines, including those that meet 2017 greenhouse gas regulations. Its advanced Isosyn technology ensures longer oil life and enhanced wear protection, which means you can enjoy extended engine performance. The oil is certified clean, meeting OEM cleanliness standards, helping you reduce maintenance costs and minimize downtime. With excellent control over piston deposits and turbocharger protection, this oil ensures that your engine components remain in top condition, providing peace of mind and reliability on the road.

The AC Delco DexosD 0w-20 Oil Change Kit is the perfect choice for those who want to keep their Duramax Diesel LM2 running smoothly. This kit includes 7 quarts of synthetic oil and 1 PF66 filter. The oil exceeds ILSAC GF-5/API standards for protection against deposits, wear, and low speed preignition, making it especially suitable for turbocharged engines. It also meets ILSAC GF-5 and API Service Classification requirements, ensuring it is suitable for use in modern engines. With this kit, you can rest assured that your engine will be protected and running efficiently.

Mobil 1 Diesel Truck Oil is specially formulated for modern diesel engines, offering extended drain intervals and outstanding performance. By using this oil, you can experience potential fuel savings while ensuring your engine operates smoothly. It meets or exceeds the rigorous standards set by major truck manufacturers, making it suitable for mixed fleet operations. Additionally, it is recommended for high-performance diesel applications, including low-emission engines, which helps you maintain compliance with environmental regulations. This oil also protects your engine by minimizing sludge buildup at low temperatures and deposits at high temperatures, ultimately extending the life of your vehicle.

Valvoline Premium Blue Extreme Diesel Engine Oil is a full synthetic motor oil that provides excellent wear protection, resists oxidation and fights deposits & sludge, protects during cold start-ups while controlling soot, and offers advanced fuel economy. It also has a unique 5,000 miles oil drain extension and is exclusively endorsed and recommended by Cummins. This American-made and formulated motor oil is perfect for heavy-duty applications and can maximize engine life and improve performance.

The Schaeffer Diesel Engine Oil offers excellent benefits for your diesel engine. It ensures fuel efficiency while providing durability, so you can drive confidently without worrying about your engine’s performance. With superior cold weather startability, you can expect reliable operation even in chilly conditions. This oil also withstands higher temperatures better than conventional oils, which means it’s built to handle tough driving situations. Additionally, its keep-clean performance helps break down soot and disperse deposits, keeping your engine cleaner and running smoother. These features make it a smart choice for any diesel engine owner.

Shell Rotella Diesel Engine Oil is a full synthetic 5W-40 oil that offers exceptional protection and performance for a wide range of heavy-duty engine applications. With Triple Protection Plus technology, this oil protects against wear, deposits, oil breakdown, and improves low-temperature flow. It also provides enhanced fuel economy capability of 1.5 percent without compromising engine protection or durability. The multi-functional dispersant additives offer an enhanced level of protection against the effects of soot, dirt, and other contaminants. Additionally, this oil has increased shear stability for better viscosity control and optimal engine oil pressure. With its better cold-cranking properties and low-temperature pumpability, it ensures critical engine parts are reached faster. The ergonomic design of the case makes it easy to handle and pour. Lastly, its advanced low ash formulation helps protect the exhaust catalysts and particulate filters found in low-emission vehicles.

If you're looking for a high-quality diesel engine oil, the Mobil 1 Delvac 1300 Super 15W-40 Diesel Engine Oil is an excellent choice. Designed for diesel engines requiring 15W-40 engine oil, this product will help extend your engine's life thanks to its unique additive system. With 128 fluid ounces in each bottle, you'll have plenty of oil to keep your engine running smoothly. Whether you're a professional mechanic or a DIY enthusiast, this motor oil is a great option to consider.

The Shell Rotella T5 15W-40 Synthetic Blend Diesel Engine Oil is a high-quality motor oil that offers exceptional protection and performance. Its Triple Protection Plus technology provides protection against wear, deposits, and oil breakdown. The oil is perfect for on-highway fleets, construction, and agricultural machinery, and diesel pickup trucks. It delivers improved low-temperature flow, controls engine deposits, and helps extend oil drain intervals. The oil has an ergonomic design for easy handling and pouring, making it a go-to for those who value convenience and effectiveness.

Valvoline Diesel Engine Oil is a high-quality motor oil designed to provide excellent wear protection in heavy-duty applications. It is specially formulated with high-quality base oils and special inhibitors to resist oxidation and fight deposits. This oil is specifically designed to protect heavy-duty diesel engines under extreme load regimes and severe idle time. It is perfect for use in harsh environments experienced in construction, mining, agriculture, and more. With Valvoline Diesel Engine Oil, you can be confident that your engine will be well-protected, ensuring its longevity and optimal performance.