8 Best Oil For 6.7L Cummins (Review & Buying Guide) in 2023

To keep your 6.7L Cummins engine running smoothly, you can't go wrong with options like Valvoline SAE 15W-40 and Shell Rotella T6 5W-40, both of which provide outstanding protection and performance. Valvoline Premium Blue 5W-40 is a great fully synthetic choice, while Delo 400 SDE and Cummins Onan 15W-40 offer advanced engine efficiency. Don't overlook Quaker State 10W-40 and Mobil 1 5W-40 for excellent wear protection and longer intervals. You'll find even more top choices ahead.

Valvoline SAE 15W-40 Diesel Engine Oil

When it comes to protecting your 6.7L Cummins engine, Valvoline SAE 15W-40 Diesel Engine Oil stands out as a top choice.

This oil offers ultimate protection and enhances performance, making it ideal for heavy-duty applications. You'll appreciate its oxidation resistance, ensuring long oil life even under high temperatures.

Valvoline meets API SN and SM standards, providing excellent engine protection. Its unique design reduces wear and maintenance needs, while also cooling engine parts during heat.

Compatible with trucks and tractors, it delivers the reliability and efficiency you need to keep your engine running smoothly for years to come.

Shell Rotella T6 5W-40 Diesel Engine Oil

If you're looking for an oil that combines advanced protection with improved fuel economy for your 6.7L Cummins, Shell Rotella T6 5W-40 Diesel Engine Oil is an excellent choice.

This full synthetic oil reduces friction and impurities, ensuring prolonged engine life. Its advanced additives provide superior protection against dirt, soot, and contaminants, giving you peace of mind during extended intervals.

With outstanding shear stability, it maintains viscosity and pressure even under tough conditions. Plus, it meets vehicle emissions standards, making it a responsible choice for your engine's health.

Trust Shell Rotella T6 for ideal performance and reliability.

Valvoline Premium Blue 5W-40

Valvoline Premium Blue 5W-40 stands out as a top-tier choice for your 6.7L Cummins engine, delivering exceptional protection and performance. This fully synthetic oil minimizes friction and deposits, ensuring your engine runs smoothly.

It features excellent thermal properties, providing safe starts even in freezing conditions while effectively controlling heat fluctuations. Plus, it improves fuel economy, meaning you'll use less gas over long distances.

Designed for heavy-duty equipment, Valvoline Premium Blue enhances engine life through oxidation resistance and wear protection. When you choose this oil, you're investing in reliability and efficiency for your diesel engine.

Delo 400 SDE SAE 15W-40 Motor Oil

Delo 400 SDE SAE 15W-40 Motor Oil is an excellent choice for your 6.7L Cummins engine, providing advanced protection and performance for mixed fleets.

This super-premium oil features ISOSYN technology, ensuring compatibility with four-stroke gasoline and turbocharged diesel engines. It effectively reduces CO2 emissions while meeting API SP/SN standards for engine protection.

You'll appreciate its ability to enhance engine efficiency and longevity, making it suitable for both heavy-duty applications and everyday driving.

With Delo 400, your engine remains clean and well-lubricated, reducing wear and extending its life.

Choose Delo 400 for dependable performance and protection on the road.

Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil

For those looking to enhance their 6.7L Cummins engine's performance, Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil stands out as a top-tier option.

Its triple protection formula delivers 1.5% improved fuel economy, making it efficient for heavy-duty use. The advanced additive technology effectively prevents dirt and contaminants, ensuring your engine runs smoothly over time.

Suitable for various sectors, this oil maintains its quality and performance, even under extreme conditions.

With Shell Rotella T6, you're investing in enhanced engine longevity and reliability, making it a wise choice for your Cummins engine's needs.

Cummins Onan 15W-40 Oil

When you need reliable performance for your Onan generator, Cummins Onan 15W-40 Oil proves to be an excellent choice.

This oil is specifically designed to meet the unique demands of Onan generators, ensuring peak operation without the risk of overfilling. It offers superior sludge protection and exceptional cleaning power, keeping your engine running smoothly.

You'll appreciate its ability to prevent leakage and broken seals, enhancing the longevity of your generator. Ideal for motorhomes, this oil guarantees reliable performance during extended operational hours, making it a smart investment for any generator owner looking to maintain efficiency and effectiveness.

Quaker State 10W-40 Motor Oil

Quaker State 10W-40 Motor Oil stands out as a strong contender for those seeking reliable engine performance. It meets API SP/SN PLUS/SN industry specifications, ensuring your engine gets the protection it needs.

With its ergonomic design, applying the oil becomes a hassle-free experience. This motor oil provides durable wear protection, effectively removing rust and absorbing mechanical shocks for smoother operation.

It maintains viscosity during stop-and-go driving, making it suitable for various conditions. If you want an oil that balances performance with convenience, Quaker State 10W-40 is a solid choice for your 6.7L Cummins engine.

Mobil 1 5W-40 Motor Oil

Mobil 1 5W-40 Motor Oil is a versatile option that caters to a wide range of vehicles, including trucks and motorcycles.

This fully synthetic oil offers an extended drain interval of about 1,500 miles, saving you time and money on maintenance. It combines conventional and synthetic oils to provide ideal performance, maintains viscosity under various conditions, and prevents oil leaks.

Additionally, it enhances engine efficiency, ensuring your engine runs smoothly. With its powerful formulation, Mobil 1 5W-40 helps protect against wear and tear, making it an excellent choice for maintaining your 6.7L Cummins engine's longevity.

Frequently Asked Questions

How Often Should I Change the Oil in My 6.7l Cummins?

You should change the oil in your 6.7L Cummins every 7,500 to 10,000 miles, depending on your driving conditions. Regular changes keep your engine running smoothly and prolong its life considerably.

Can I Mix Different Brands of Engine Oil?

You can mix different brands of engine oil, but it's not perfect. Each brand may have unique additives that could interact negatively. Stick to one brand for best performance and protection of your engine.

What Viscosity Is Best for High Temperatures?

For high temperatures, you'll want to use a higher viscosity oil, like 10W-40 or 15W-40. These options maintain better thickness under heat, ensuring your engine stays well-lubricated and protected during extreme conditions.

Is Synthetic Oil Worth the Extra Cost?

Synthetic oil's worth the extra cost if you value performance and protection. It offers better oxidation resistance, cleaner engines, and longer intervals between changes, ultimately saving you money and time in the long run.

How Do I Know if My Oil Is Low?

To know if your oil's low, check the dipstick regularly. If it's below the recommended level, it's time to add oil. Look for changes in performance or unusual engine noises, too.

About the author

Hi, I'm Jake Thompson, bringing over 15 years of experience in auto repair to CarServiceLand, my personal project where I share my passion and insights into automotive repair. As a seasoned car expert with years of experience in fixing cars, satisfying countless customers, and staying updated with the latest trends, I am fully confident in my ability to tackle any car problem that comes my way. This site is fueled by my dedication to sharing those insights and connecting with fellow auto enthusiasts

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