Choosing the right oil for your 6.7 Cummins engine can be daunting since you need to know the oil specs required by manufacturers. Using the wrong oil can lead to damage to the engine.
The 6.7 Cummins engines require 5W40 or 15W40 depending on weather conditions or your driving habits.
This article provides a detailed review of best 5W40 and 15W40 oils for your 6.7 Cummins. You’d be sure to pick the right product to keep your vehicle in fighting form.
Keep reading to find out more!
Best Oil for 6.7 Cummins
Best 15w40 Oils For 6.7 Cummins
Cummins Onan 15W-40
Valvoline Premium Blue SAE 15W-40
Shell Rotella T5 Synthetic Blend 15W-40
Cummins Onan SAE 15W-40
Cummins Onan 15W-40
The Cummins Onan 15W40 Oil is ideal for people who consider saving a few dollars with OEM quality. Since it is OEM approved, you will have no worry when using it as the product won’t void the warranty of your vehicle. A plus point for the product is its cheap price. However, the low price does not skimp on quality.
This oil is specific for Cummins systems, efficiently limiting oil consumption. It is especially useful at high temperatures when viscosity tends to rise quickly. More than that, one of the main components of Onan oil is friction regulators. This helps prevent it from compromising lubrication. Besides, this oil can help your engine run more reliably by addressing oxidation damage as well.
Valvoline Premium Blue SAE 15W-40 Diesel
Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil
This Valvoline premium blue engine oil is the only one Cummins recommendation for their engines, and it is also a favorite amongst other major vehicle businesses. The product is API-tested for Cummins Diesel Engines. The superior oxidation resistance improves soot control and extends engine life, allowing for less replacement.
You will notice a significant gain in fuel efficiency and proficiency with consistent use. There is also no risk of voiding the warranty that comes with the product. Cummins estimates that the oil will last 5.000 miles under typical operating conditions while preserving viscosity and overall performance. This is partly correct because it has lower high-temperature carbon build-up (implying better oil usage) and has above-average soot management.
Aside from Cummins’ endorsement, this oil has the makings of a superb oil. It improves the performance of your engine while cutting your vehicle’s fuel consumption and keeping your engine clean. It also lasts a long period of time without losing its quality. Valvoline premium blue engine oil could be best for your 6.7 Cummins if you often travel between climates.
Related: 6.7 Cummins Oil Capacity & Oil Type
Shell Rotella T5 Synthetic Blend 15W-40 Diesel
Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil
This engine oil is identical to the Shell Rotella T6. However, there are a few important distinctions. T5 is a synthetic combination that includes some crude materials, whereas Rotella T6 is entirely synthetic. That’s not to say it’s a bad thing. It is a low-ash, low-emission motor oil ideal for use in Cummins engines.
What’s else? The lubricant is promising for fuel efficiency, wear-resistance and delivers on both fronts. You may also enjoy how nicely it keeps pressure in turbocharged engines.
However, keep in mind that the cap of the bottle leaves much to be desired. The threads can chip, making it very hard to reattach the seal. Because it comes in a gallon, you’ll most likely need to keep it. You should be careful when opening and retightening it.
So, if you intend to use synthetic blend oil to improve fuel economy, then you can go with this Shell Rotella T5.
Best 5w40 Oils For 6.7 Cummins
Shell Rotella T6 Full Synthetic 5W-40
Valvoline Premium Blue Extreme 5W-40
Mobil 1 5W-40 Turbo Diesel Truck
Shell Rotella T6 Full Synthetic 5W-40 Diesel
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil
The Shell Rotella T6 is synthetic engine oil that outperforms conventional options. Aside from lowering fuel consumption, the Shell Rotella T6 protects an engine from wear and typical pollutants.
If you desire an oil that will not break down due to heat or lose its viscosity, the Shell Rotella T6 is exceptionally durable. The product provides the same degree of protection during the service period. It will also maintain the engine’s appropriate pressure at all times.
Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic
Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Diesel Engine Oil
Valvoline Premium Blue is another great pick for 6.7 Cummins engines. As it stated in the bottle, the only oil is endorsed and recommended by Cummins for both off highway and on road applications.
It is designed for severe driving conditions and ensure year-round performance. The oil provides excellent protection for your engine in both hot and cold weather. It helps enhance thermal properties in hot temperatures and guarantees safe starts during extreme cold weather.
Another exceptional feature of this Valvoline Premium oil is its excellent fuel economy ability (up to 1.5% over the 15W-40 ). It’s hard to link a rise in performance with increased fuel consumption, but this Blue Extreme can do the case. This Valvoline oil is a great option for fuel efficiency and engine performance.
Plus, the lubricant also helps extend the drain intervals and reduce oil changes. So your engine is ensured to work longer between downtime.
Mobil 1 5W-40 Turbo Diesel Truck Synthetic
Mobil 1 5W-40 Turbo Diesel Truck Synthetic Motor Oil
If your location is prone to snowstorms, go with the Mobil 1 Turbo Diesel Truck Oil. Its cutting-edge technology, which includes innovative chemicals to preserve your car effectively. Mobil 1 Turbo Diesel Truck Oil is particularly capable of managing the remarkable horsepower of a 6.7 Cummins engine. It improves the overall performance of your vehicle by minimizing oil loss and increasing fuel efficiency.
With a design compatible with every type of oil on the market, current automobiles will benefit. If your vehicle has Exhaust Gas Recirculation, this oil will be a nice complement. As mentioned earlier, 5W40 oil is better suited for colder climates. When considering your option, keep your environment in mind.
Related: Cummins ISX Oil Capacity & Oil Type
Final Words
Things may easily get complex when it comes to selecting the correct oil for your engine. Most oil brands function similarly at the highest price range. The features to consider while picking the proper oil for your 6.7 Cummins may depend on your needs.
However, it is safer to stick with professional recommendations like Valvoline Premium Blue Extreme SAE 5W-40 and 15W40.
Valvoline Premium Blue Extreme 5W-40
Valvoline Premium Blue SAE 15W-40
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