Best Oil for 6.7 Powerstroke: Top Options for Max Performance in 2020
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Best Oil for 6.7 Powerstroke in 2020

Powerstroke engines generate more heat compared to other diesel engines primarily due to the extreme conditions they operate in. But since they are relied on for their high performance, pulling, towing, and other heavy-duty tasks are a cinch.

According to Ford, the recommended oil for their powerstroke engines is an API CJ-4 motor oil. For normal use, a viscosity rating of 10w-30 is a standard. As for heavy use and biodiesel applications, Ford recommends a 15w-40 oil.

Nevertheless, still check your owner’s manual for varying viscosity recommendations as they depend on ambient temperature.

With all that said, choosing the best oil is important for keeping a powerstroke engine well-maintained. In this buying guide, we’ve put up a comprehensive list for you to find the best oil for 6.7 powerstroke engines. Take full advantage of your heavy-duty vehicle with the powerstroke oils below.

Top 4 Engine Oils for 6.7 Powerstroke in 2020

1 –  Shell Rotella T6 Synthetic Diesel Motor Oil SAE 5w-40 CJ-4

First is this oil from Shell. When you search for the best synthetic diesel motor oil in the market, Shell  Rotella T6 engine oil is one of the most prominent names that pop up in many a list. That’s because it’s a great all-around oil for most engines, and the power stroke from Ford is no exception.

Shell Rotella T6 actually has a cult following and is recommended by many for its versatility, superb performance, and protection. 

Many users love this Rotella T6 oil because of its superior protection, low-ash formula, and the good proprietary additives that ensure your Ford power stroke engine is protected against the formation of different contaminants that harm the engine.

And of course, that is what you need to keep your power stroke still in top top shape all the time. The Rotella T6 is a heavy duty diesel motor oil meant for a heavy duty 6.7 powerstroke.


  • Synthetic formulation has a lot of benefits
  • Great value
  • Improves fuel economy
  • Handles pressure and high temperatures well
  • Low-ash oil formulation


  • For some customers, new bottles have leaked during shipping

With its synthetic formulation, Rotella T6 oil effectively cleans the powerstroke engine and protects it from sludge formation. Multi-functional dispersants are infused in this motor oil for combatting the formation of dirt, soot, and other harmful contaminants that cause engine damage.

To take it up another level, this oil has a low-ash formula for preventing wear, foaming, and aeration. As you can see, you have no reason for doubts with this oil. It even improves fuel economy.

With its SAE 5w-40 viscosity rating, this oil is excellent for high temperature powerstroke operations. This is extremely important since powerstroke engines handle a lot of pressure, and this diesel motor oil resists viscosity loss for zero breakdowns even for heavy-duty trucks or vehicles.

As such, you can count on this oil to do all the hard work for you so your engine will run smoothly.

Overall, Rotella T6 is one of the highly-rated, widely-used engine oils. It’s well loved by many consumers due to its reliability and the value it gives. It will be a long time until your next oil change, as compared to other engine oils.

You can think of it as a generic diesel engine oil more than a specialized one for a powerstroke engine, but it’s definitely one that won’t disappoint.

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2 – Motorcraft Super Duty SAE 15w-40 Synthetic Ford Diesel Motor Oil

Want a highly-specialized powerstroke engine oil rather than a generic one? Then the Motorcraft Super Duty Diesel Motor Oil is the perfect pick on our list. This engine oil is formulated by the Ford Motor Company itself, guaranteeing only the best performance, protection, and cleaning action for your engine.

It’s right that you something that perfectly matches your vehicle, and you don’t have to search far and wide to do so because this engine oil will do the job amazingly for your diesel engine.

Since the oil is specific to the name, this super duty diesel motor oil is greatly recommended and one of the few that meets all the engine oil requirements set by Ford. So if a Ford truck is what you own, you definitely won’t go wrong with this oil. Everything will fit like a glove.

Still, this oil is also compatible with Cummins CES 20086, Detroit Diesel 96K22, Volvo VDS – 4.5, and Mack EOS – 4.5. 


  • Brand-specific for Ford powerstroke engines
  • Excellent protection against corrosion and wear
  • Works great with older-generation diesel engines 
  • Superior lubrication
  • Meet Ford requirements


  • Expensive

This specific engine oil for Ford is formulated with premium hydroprocessed base oils and proprietary additives — both working together to give the best protection and performance that a powerstroke engine needs.

You can expect excellent lubrication from this oil, keeping the critical powerstroke engine parts from having metal-to-metal contact.

Cleaning is superb as well because this heavy-duty oil is great for fighting the formation of dirt, soot, grime, sludge, and all the undesirable byproducts of combustion. Your Ford truck is working as hard as it can, so using something that works just as hard is important. 

Another thing that we like about this engine oil is it’s great for older-generation powerstroke diesel engines. Have a vehicle or truck that already has 200,000 miles in it? This oil from the Ford Motor Company can still make that diesel engine run like it’s almost new. Now that’s excellent power for a powerstroke!

All in all, this Ford diesel motor oil perfectly matches all the requirements of a powerstroke engine. If you want the best power stroke diesel oil that ticks all the right boxes for a diesel engine, then look no further than this oil.

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3 – Royal Purple Duralec Ultra 10w-30 Full Synthetic Diesel Motor Oil

Royal Purple’s reputation in the motor oil industry is commendable. When you think of high-quality motor oils, Royal Purple is a name that belongs to one of the best brands.

Their name has been making significant rounds in the industry for many years now, and they made their way to the top by working with race cars and other heavy duty vehicles. So it’s really no surprise that they provide some of the best oils.

For powerstroke engines, one of their recommended products is the Duralec Ultra 10w-30 — a high-performance CI-4 Plus engine oil that’s engineered for heavy-duty diesel engines. 

The Synarlec additive technology is the claim to fame of this oil. This tech forms a high-strength oil film that protects powerstroke engine parts by forming an ionic bond with metal surfaces. As such, metal-to-metal contact is prevented from damaging the engine overtime.

Furthermore, the resistance to oxidation and corrosion are enhanced by this oil, ultimately for a long engine life.


  • Synarlec additive technology provides ultimate powerstroke engine protection
  • Synthetic formula
  • Cleans well
  • Great oil for heavy-duty use


  • Purple color of the oil makes it a bit tricky to tell if the oil is dirty

As for cleaning capabilities, the synthetic formulation of this oil will keep parts cleaner compared to sole detergents. Soot, dirt, grime, and other deposits are prevented from forming in your powerstroke engine. This synthetic engine oil also reduces parasitic loss for that much-needed savings on fuel.

The Royal Purple Duralec Ultra 10w-30 is recommended for use in both two-cycle and four-cycle diesel applications including automotive, commercial fleet, and stationary industrial engines.

In a nutshell, the Royal Purple Duralec Ultra 10w-30 motor oil is one of the best oils for a powerstroke engine.

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4 – Schaeffer 700 SynShield Durability Advantage 15w-40 Synthetic Oil

Another popular brand that’s best for heavy-duty diesel engines is the Schaeffer 700 SynShield Durability Advantage. This oil does meet and exceed numerous API service categories for vehicles, with the approved list including CK-4, CJ-4, CI-4, CI-4 Plus and older, making it the perfect oil for a powerstroke.

This full synthetic oil is designed for exceptional cleaning and protection from wear, oxidation, aeration, deposit formation, and soot contamination that a powerstroke engine is prone to. Its low-ash formula keeps deposits, soot, sludge, and other deposits at bay for keeping your engine at optimum state.

This full synthetic diesel motor oil will last longer than the usual engine oils you find. That’s clearly a good sign since oil changes will be less frequent. Therefore, you save way more money as well!

This oil is also able to control your oil consumption with its super low votality characteristics. And these days, saving money is a priority as prices get higher and higher.

In addition, this oil also optimizes the durability and reliability of the engine during high mileage and hour accumulation situations.


  • Exceeds a wide range of engine requirements including powerstroke
  • Excellent cleaning and protection from wear
  • Low-ash formula for further engine protection
  • Low volatility so you get a lower oil consumption
  • Less frequent oil change
  • Meets industrial standards
  • Lasts long


  • Expensive

Compared to conventional CJ-4 oils, the Schaeffer 700 SynShield Durability Advantage oil boasts 85% less wear and 77% greater soot handling for your powerstroke engine. Plus with high thermal and oxidative stability, this oil is resistant to thickening and sludge formation.

This makes the oil last long and therefore make the next new oil change further down your calendar.

Proprietary friction modifiers such as Micron Moly and Pentro effectively provides a slippery shield for engine parts to glide smoothly against each other. As such, pistons, bearings, and other parts are protected from friction brought about by metal-to-metal contact.

And of course, that’s super important for a power stroke engine. A diesel engine definitely works hard, and if it’s not properly lubricated, it would not last very long. You don’t want that to happen, of course. That’s why you need engine oils that are effective lubricants and will also clean up deposits.

Your powerstroke engine also won’t experience breakdowns with this synthetic engine oil, even when operating at high temperatures and extreme conditions.

Engineered for maximum durability and longevity, the Schaeffer 700 SynShield Durability Advantage oil is definitely one of the best oils recommended for a Ford powerstroke engine. 

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Our Top Pick – Motorcraft Super Duty 15w-40

For a powerstroke, nothing beats the performance provided by the Motorcraft Super Duty Oil. Excellence in lubrication, cleaning, and overall performance are what make this oil the best.

After all, powerstroke engines and this oil are both produced by Ford, so it’s really a no-brainer how well they work together. It meets the standards and it has superior performance.

If you want an oil that will give your powerstroke engine unmatched performance even in extreme conditions, this oil delivers exactly that. 

How to Choose the Best Motor Oil for a Powerstroke Engine

You know by now how tricky it is to find the best engine oil for a powerstroke engine. While that is a fact, the search for a new oil doesn’t have to be hard. That’s why we’ve compiled the best of the best in the buying guide above — to help you find the oil that will fit the needs of your truck.

Still, you may still have a few questions in mind when it comes to choosing the right oil for diesel engines. To make things easier so you don’t have to dig through posts, here are some factors you should consider:


Aside from the name, one of the first questions to ask is whether the oil is compatible to the engine. At the very least, the oil you’re going to buy should meet the Ford specification WSS-M2C171-F1. A powerstroke engine demands a lot of protection from combustion byproducts and high temperatures.

Ensuring that the oil you’re going to buy is compatible for a powerstroke is the best thing you can do to keep it in tip-top shape and make sure it meets standards.

Additive Package

There are different kinds that can be added to motor oil. Generally speaking, some of the kinds include rust inhibitors, dispersants, friction modifiers, antioxidants, antiwear, and antifoam agents. Some companies incorporate their own proprietary ones for their specific products.

The best oils have a superior additive package to keep your powerstroke engine free from sludge, grime, varnish, deposits, and other harmful contaminants. You don’t want to have an oil change more frequently than necessary. Here’s a short list of benefits engines get from a great additive package:

  • Superior cleaning. As you know, there are a lot of harmful contaminants that develop in diesel oil. Dispersant and detergent additives work best to clean all the sludge and dirt that forms in diesel oil.An additive package that’s using biocide can help eliminate grime because it feeds on bacteria and microbes.
  • Boost performance. Some additives can increase the performance of your oil. This goes hand in hand with fuel economy and longevity of engines as well.
  • Anti-wear. Corrosion inhibitors, ZDDP, and lubricity improvers further help protect engines from wear and tear when using. Basically, it’s key to a long lasting engine.


Viscosity basically refers to the oil’s resistance to low and high temperatures. For a powerstroke engine, normal-use trucks and vehicles should have an oil with 10w-30 viscosity rating. On the other hand, a heavy-use powerstroke is suggested to have an oil with 15w-40 rating.

These recommendations are based on Ford’s requirements, but it’s important to check for possible variations in your user manual.

Keep in mind that diesel oil naturally behaves differently depending on the change in temperature. At low temperatures, viscosity increases and the molecules gel up. Whereas at high temperatures, the viscosity decreases and then the molecules stop flowing.

Because of that, manufacturers have to add viscosity improvers to the base oil. These are the two oil viscosity grade specifications as provided by the Society of Automotive Engineers:

  • Monograde Oils – This further falls into two categories, known as the ‘winter time’ grades and the ‘summer time’ grades. How do you tell the difference? Grades that have a ‘w’ after them (such as SAE 0w, 10w, 25w) are the winter grades.That means these have a higher resistance to cold temperatures. On the other side of the spectrum, summer time grades (such as SAE 20, 30, or 40) are more suited for areas with warmer temperatures.
  • Multigrade Oils – It’s not really necessary to get a different grade of oil in the winter and a new one in the summer. Multigrade oils will give you that double action you need, as they are ideal for both low and high temperatures.These are the SAE 5w-40, 15w-40, and similar labels. As such you should choose wisely what viscosity grade you’re going to put in your diesel engine.

Then again, there are instances when using monograde engine oils are way more practical for engines. For example, if you live in an area where the environment is mostly cold, then there’s no reason for using a multigrade oil. The best thing for you to do is to really identify the temperatures your truck or vehicle operates in. That would be a good measure to finding out which grade to purchase when you buy new motor oils.


To keep a powerstroke engine in its optimum working condition, you need the right motor oil that meets or exceeds the specific requirements set by the Ford Motor Company. Choosing the best oil for a powerstroke engine can be tricky, as it is quite finicky when it comes to oils.

We hope this buyer’s guide and list on our website help you make that right decision easier, now that you know the which are the best ones in the market. 

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