The 7 Best Oil for 6.7 Cummins Engine 2023
As a driver, know that the quality of the engine oil has an effect on your mileage. This is why mechanics and auto manufacturers recommend engine oils.
Before picking the right oil for 6.7 Cummins, learn about engine oils or do your homework.
Users who pick the best oil for their Cummins engine enjoy over 300,000 miles on the engine without any problems.
Differentiating between the many oils is difficult if you have no clue which is the best one. This informative article takes a deep look at the best oil for Cummins including the various models. Also, it examines the user’s choices and the manufacturer’s recommendations.
What is the best oil for 6.7 Cummins? Shell-Rotella-Synthetic is highly recommended by both expert mechanics and automakers because of its excellent engine performance and durability.
However, consider between 5W-40 and 15W-40 variants. Some mechanics recommend Valvoline-Premium-15W-40 for high mileage. Other top engine oils with outstanding fuel efficiency and optics are given below.
Top 7 Best Oil For 6.7 Cummins
1. Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil
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Fuel Economy
The engine oil offers enhanced fuel ecomo0ny capability and doesn’t affect the engine protection or its durability. It’s a user’s choice if you want engine oil that improves your engine performance without causing engine trouble.
Better Wear Performance
This engine oil is recommended by mechanics and is a top seller for users because it offers increased protection against engine wear and is far better than previous engine oil generations like API CJ-6 engine oils.
Better Deposit Control
The engine oil has multi-functional additives combined with other synthetic base oils to give you improved engine protection against contaminants like dirt and soot among others.
Emission Systems Compatibility
This engine oil has a low-ash formulation which controls exhaust system blocking and poisoning. Besides, it helps ensure you enjoy engine fuel efficiency and is in total vehicle emission compliance.
Improved Heat Resistance
As a vehicle owner, your automobile enjoys continuous heat resistance protection without the oil breaking down. The protection lasts throughout the service interval.
Pros
- Good for the long haul
- Works efficiently in cold and hot weather
- Outstanding shear stability
- Less pollution
- Suitable for both new and old engines
- Extended drain capability
- Affordable
Cons
- Change engine oil twice a year or every service interval
2. Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Diesel Engine Oil
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Excellent Shear Stability Control
This engine oil is a top-notch and high-quality product. Mechanics love the engine oil because it handles heavy-duty vehicles well and we recommend it for 6.7 Cummins. It’s fully tested by expert mechanics and Cummins and found to offer excellent high performance.
Excellent Heat Resistance
The engine oil works well in cold, normal, and high-temperature regions. Users and mechanics can use the same engine oil for 6.7 Cummins regardless of the weather. The engine oil is extra thick.
Greater Emissions Control
You can use the engine oil on a diesel engine without fearing blowback on emissions control or lubrication. It’s an excellent choice because of its emissions compliance.
Fuel Economy
The Valvoline-Premium-15W-40 engine oil increases your fuel economy and gives you added engine protection. Your vehicle enjoys greater mileage.
Pros
- Cummins recommended engine oil
- Longer engine oil service interval
- Excellent contamination protection
- Usage includes the cold, normal and high-temperature region
- Affordable
Cons
- Change every service interval
3. Delo 400 XLE Heavy Duty Synblend Diesel Engine Oil 15W-40
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Vehicle Emissions Compliance
The engine oil is certified clean and the lubricant meets all OEM requirements to minimize engine downtime. This reduces your maintenance costs and extends your engine life.
Excellent Deposit or Contaminant Control
The oil has excellent turbocharger protection and outstanding piston deposit control because of its excellent oxidation performance. The added dispersant additives offer improved engine protection.
Better Wear Protection
The engine oil is highly recommended for Cummins because of its durability. The improved wear protection gives you longer engine life. As a user, you get value for your money.
Pros
- Longer engine life
- Smooth cold startups
- Efficient for high-temperature regions
- Engine runs stronger and for longer mileage
- Less expensive
Cons
- Limited stocks probably because it’s high in demand
4. Rotella 550050467 3PK Synthetic 15W-40
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Excellent Shear Stability
The Rotella engine oil maintains optimal oil pressure while resisting viscosity loss. The change is viscosity grade makes it attractive to expert mechanics and for servicing vehicles including Cummins.
Improved Heat Resistance
You can use the engine oil in cold regions without any drop in performance or startup issues. The fuel blend has excellent heat resistance and works efficiently in high-temperature regions too.
Improved Engine Life
The Rotella engine oil uses triple protection and has a full blend of advanced additives for longer engine life. It’s highly recommended for Cummins if you want prolonged engine life and added protection.
OEM Emission Compliance
the oil contains additives that protect your engine from debris, soot, and other harmful contaminants. Also, it has a low-ash formulation.
Fuel Economy
This engine oil protects your engine and increases the engine mileage. It enhances your engine performance.
Pros
- Improves your engine fuel economy
- Recommended for Cummins and heavy-duty diesel engines
- Improves engine performance and prolongs its life
- Oil pressure remains constant throughout without losing viscosity
- The engine runs quieter and is healthier
- Affordable
Cons
- The bottles lack a foil seal underneath
5. Valvoline Premium Extreme Synthetic Diesel
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Excellent Heat Resistance
This engine oil is recommended for Cummins and works both under extreme cold and hot temperatures, giving you excellent performance.
The 5W-40 viscosity grade engine oil is an improvement of the conventional 15w-40 engine oil.
Unique Drain Extension
Heavy-duty engines mostly need a regular change of engine oil. However, the Valvoline-Premium-Extreme-Synthetic has a unique drain extension making it retail oil quality and can handle longer mileage of over 10,000 miles.
Better Wear Protection
The oil gives your engine better protection from soot, debris, and other harmful contaminants. Mainly because the oil doesn’t oxidize fast like common engine oils. The oil makes the engine run smoothly and you enjoy improved fuel efficiency.
Pros
- Ideal selection for both cold and hot temperatures
- Comes with added 10,000 miles of the drain extension
- Better thermal resistance
- Prolongs engine life and fuel efficiency
Cons
- Change oil bi-annually for better engine performance
6. Cummins 3265336 Onan SAE 15W-40 Oil
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Universal Engine Oil
Highly recommended for Cummins by expert mechanics because it protects your engine from wear and lowers your fuel consumption.
Cummins owners love engine oil because it’s affordable and works well for their engines.
Improved Fuel Economy
The engine oil makes your fuel burn cleaner and more efficiently. Your fuel consumption drastically drops and also works well for generators.
Excellent Shear Protection
The engine oil is well-formulated to reduce your engine wear. This is a conventional oil that provides maximum protection.
Factory Recommended
This engine oil is both factories tested and recommended. Expert mechanics also highly recommend it because of the fuel efficiency, improved engine performance and universal function.
Pros
- Handles extreme temperatures well and efficiently.
- Less pollution
- Affordable oil
- Reduces engine wear and fuel consumption
- Recommended by generator mechanics
Cons
- The oil change interval is 250 hours only
7. Mobil 1 122094 5W-40 Formula M Motor Oil
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Better Shear Stability Control
The engine oil has extra cleaning additives and anti-wear additives to give your engine a longer life.
Synthetic motor oil gives your engine the ultimate protection and performance boost by ensuring it constantly runs like it’s new.
OEM Emission Compliant
The engine oil reduces catalytic converter poisoning and increases fuel efficiency. Your motor enjoys enhanced engine performance.
The oil reduces sludge buildup, soot, and debris to give you a clean engine and enhanced engine life.
Extended Drain Protection
The engine oil runs efficiently and enables your engine to retain optimal oil quality even after driving for longer mileage.
Your vehicle can run for longer miles before you need to change the oil even if you are driving Cummins or a heavy-duty truck.
Pros
- Reduces oil aging by giving you a longer drain extension
- Gives you a clean engine by reducing contaminants
- Approved for Cummins engine and other vehicles
- Supports extreme driving applications
- Boosts engine start-up at cold temperatures
- Prolongs engine life
Cons
- Great product but more expensive
- Not suitable for the motor with two-cycle engines
What to Look for When Buying Oil For 6.7 Cummins
Oil Capacity
Remember later Cummins models post-2008 can only hold about 12 quarts. The oil capacity is much lower than in earlier models. For example, a 2006 V6 Cummins engine only holds 5 quarts. Always maintain the engine oil specifications and the SAE grade when filling.
Frequency of Oil Change
Older Cummins models need an oil change every 3,700 miles. However, you need large amounts of oil for the latest Cummins models. The later models need an oil change after 5,000 to 6,000 miles.
Plus, prioritize your engine maintenance and always check your oil quality regularly.
Oil under Extreme Weather/Temperature Conduction
When temperatures are low, your oil experiences pump ability problems and when temperatures are high the stability of your lubricant is vital.
These are two extreme conditions that must be addressed by the engine oil if you have engine wear and fuel economy problems.
Also, the two affect engine life. Customized synthetic oils deal with low and high-temperature conditions effectively.
How to Buy the Best Oil For 6.7 Cummins
Expert mechanics have tried and tested many engine oils and hence know their limitations. Some of the factors to consider when buying oil for your Cummins are:
- Pick an oil that offers you engine wear protection. These oils have additives that reduce engine tear and wear.
- Buy oil that enhances engine performance to save you additional expenses on products that don’t bring better value. Look for things like fuel consumption, and torque power when weighing your options.
- Pick an oil made with a technology that gives you the best results.
- Buy oil that gives you longevity before refilling or changing. Also, it should maintain high quality while giving you extended use.
- Choose an oil that can withstand extreme temperatures or conditions without compromising on quality service.
Types Of Engine Oil
There are two types of engine oils:
- Conventional oil
- Synthetic oil
Visually, the two oils are indistinguishable. The only way to tell them apart is through performance. Synthetic oil has better performance than conventional oil or semi-synthetic oils.
Most synthetic oils are highly refined crude oils while some have artificially made compounds. Synthetic oils have customized molecules that give your engine added protection. Synthetic oils reduce friction and engine sludge making them better than conventional oils.
Benefits of Synthetic Oils over Conventional Oils
- Improved deposit control and highly refined
- Cleans the engine, freeing it from contaminants and sludge
- Contain additives that enhance engine protection
- Flows freely and efficiently even in extreme temperature conditions
- Used in high-performance and heavy-duty engines because it can resist and withstand extreme temperatures
- Contains fewer emission levels hence OEM compliant
- Improved fuel and oil economy
- Cold start up the engine faster
- Doesn’t require frequent oil changes like conventional oil
- Wear or shear-resistant reducing engine drag because of thickening oil
- Cleaner and environment friendly
- Prolongs engine life and saves your regular service costs
Final thoughts
To summarize it all, Shell Rotella Synthetic 1 Gallon is our top choice because it has better capabilities than others and continuously protects your engine from stubborn deposits and contaminants.
The oil cleans up your engine while maintaining excellent performance. The oil has a cleaner rate 40% higher than the current industry standards making it the best oil for 6.7 Cummins you can buy.
Most people and mechanics use synthetic oil because of its lifetime impact and ultimate fuel economy.
Picking the right oil for 6.7 Cummins is crucial if you want exceptional engine performance.
The right choice depends on the engine make and model, which guides you on the right oil brand. The buying guide helps you understand the nature of the oil to buy for your engine and what to look for to get the best oil.
FAQs
Q. What’s the difference between 5W40 and 15W40?
Ans. 5W-40 has a high amount of viscosity improvers than 15W-40 and hence performs better under extreme temperatures than 15W-40. When at operating or normal temperatures, both oils are indistinguishable.
However, 5W-40 is better in cold temperatures as it boosts cold startup to get your engine fired up faster than 15W-40. The lowest oil flow temperature for 5W-40 is 5 degrees and for 15W-40 is 15 degrees.
5W-40 oil is recommended for vehicles with demanding engines and for recent vehicle engines. The oil is 100% synthetic. 15W-40 is more suitable for engines of older vehicles at least 12 years or those engines without turbo.
Also, the oil is recommended for high-mileage vehicles. The oil is thicker and loses its lubricating properties quickly. Therefore, reduce your emptying intervals.
Q. How many hours will a Cummins 6.7 last?
Ans. The expected life expectancy is around 200,000 to 250,000 miles (3333.33 to 4166.67 hours). At this time, you start experiencing power or compression loss in any driving condition. How long your Cummins 6.7 lasts past that mileage depends largely on your usage. Minimal usage means you can get past the 250,000 mileage slightly.
Q. How much oil does a 6.7 Cummins take?
Ans. A 6.7-Cummins turbo diesel engine has an oil capacity of approximately 12 quarts and there are three variations available as of the 2013 model year. Earlier Cummins models had 5.9-liter engines, which is considerably smaller than the latest models.
Q. How often should you change the oil in a 6.7 Cummins?
Ans. If you have an older Cummins, then change the oil every 3700 miles. Later models have a larger capacity and take more oil, so the recommended oil change interval is after every 5000 miles or 6,000 miles. Prioritize your engine maintenance and always check the oil quality regularly.
Q. How long should I let my 5.9 Cummins warm up?
Ans. Averagely 10-15 minutes. During winter, you need 25 to 30 minutes. A warm vehicle makes your work easier. Anything turbo needs at least 10 minutes to warm up for effective oil circulation through the turbo.
Q. How many thermostats does a 6.7 Cummins have?
Ans. Two. There are a 190 degrees thermostat and the 200-degree thermostat. Install a replacement thermostat to continue to enjoy the right engine operating temperature.
The efficiency of your engine cooling system and vehicle application has a bearing on the most suitable thermostat to install between the two.
Q. How many MPG does a 5.9 Cummins get?
Ans. Roughly 29MPG is sufficient whether intercity or highway. This will give you enough power to do the work reliably taking into consideration any modifications or load.
More enhancements and greater displacement of the 5.9-liter Cummins engine give you more power, a cleaner, and quieter running engine as well as fuel efficiency.
Q. Is 5W-40 good for diesel engines?
Ans. Yes. This is a good oil choice for all temperature conditions including freezing cold temperatures. Plus, 5W-40 significantly lowers your vehicle emissions from the diesel engine.
This saves you both fuel and oil. The health of your engine is crucial to improved performance and durability. Using oil that protects the engine from deposits and contaminants ensures there are no damages and other problems.
5W-40 ensures your vehicle engine roars to life quicker during extremely cold temperatures because the oil circulation is efficient even in freezing temperatures. Good engine oil is one that flows easily through your engine system thereby guaranteeing you high engine performance.
Q. How often should you change crankcase filter 6.7 Cummins?
Ans. The change interval is 67,500 miles from the moment you see the warning message on your dashboard. Changing the crankcase filter is easy and you can do it yourself if you want or contact your mechanic.
As a vehicle owner, you can change your crankcase filter at a shorter service interval to ensure you enjoy efficient engine performance. The crankcase filter performs the crucial task of preventing the oil vapors from going into your engine turbo.
Q. What is the most reliable diesel truck engine?
Ans. Definitely, the 5.9-liter Cummins 12-valve because it has higher durability and comes with 440lb/ft, torque, 230hp, and a P7100 inline injection pump.
Diesel enthusiasts love the 5.9L Cummins and have the flexibility to boost their engine horsepower to 500 or more with ease. The engine is extremely simple and reliable, and features enhanced fuel economy.
