Best Synthetic Oil for Ford 6.7 Diesel
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Best Synthetic Oil for Ford 6.7 Diesel Review & Buyer’s Guide

Are you the proud owner of a full-size Ford truck? And maybe it’s time for you to switch the old, clogged engine oil with something brand-new? If the answer is yes to both questions, then the best synthetic oil for Ford 6.7 diesel is what you should be looking for right now. Good news: I did all the research and manual testing for you and have just the right picks!

I made a list of five top-quality oils manufactured by the leaders in the field. Some of them improve the MPG ratio, while others protect the engine and increase its lifespan. And then there are lubricants that withstand temperature extremes and take heavy-duty truck performance to the next level. Yes, every single canister/jug has its own perks. Go ahead and take a good look at each!

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1. Shell Rotella T – Best Full Synthetic Oil for Ford 6.7 Power Stroke Diesel

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil

We start the list of the best synth oils for the 6.7-lit V8 with Shell Rotella’s T6. It is available in a wide range of sizes, volumes, and packs, which makes it a rather versatile product. Plus, it ensures an increase in mileage – that’s always good news, especially in the long run. To top that off, this oil has superb protection against temperature extremes. It stays consistent no matter how hot or cold it is outside.

Formulated with premium additives, it protects the engine from dirt, deposit buildup, and other contaminants. On the downside – this is one of the most expensive aftermarket oil brands. So, if you’re on a tight budget, you might be better off with the other products on the list. But, as a high-quality lubricant, it will be a good investment.

Product Rating
Longevity
5 / 5
Mileage
5 / 5
Value for money
5 / 5
Result
5
Pros & Cons
Gives fuel efficiency a nice boost
Advanced protection against low/high temperatures
Comes in different volumes and packs
Not particularly cheap

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This is a rather expensive set of oil jugs (it arrives in a pack of three). However, if you’ve got the money to spend, you’ll get an improved MPG ratio, top-notch engine protection (against a long list of things), and excellent performance in any type of weather. That’s a perfect combo for a diesel engine.

2. Ford – Best Super Duty Diesel Synthetic Oil for 6.7 Powerstroke

Genuine Ford Fluid XO-15W40-5QSD SAE 15W-40 Super Duty Diesel Motor Oil

Next on the list, we’ve got elite synthetic oil produced by Ford. It was specifically manufactured to be a perfect fit for heavy-duty engines. It’s recommended by the company’s engineers, by the way, and will serve longer than pretty much any other product on the market. The XO-15W40 oil meets and exceeds most standards requirements of leading brands as well.

Another standout feature is the enhanced compatibility. This lubricant is equally good for newer and older engines. So, yes, you’ll be able to use it to power up your brand-new SUV for casual driving and that good old truck for off-roading. As for the cons, some drivers report minor quality control issues. For example, containers tend to miss their API seals; in other cases, it takes the jugs a long time to arrive.

Product Rating
Longevity
5 / 5
Mileage
5 / 5
Value for money
5 / 5
Result
5
Pros & Cons
Endorsed by Ford Motors for the 6.7-lit V8
Meets and exceeds most big-brand requirements
Equally compatible with brand-new and older motors
Minor quality control issues

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If you want high-grade synthetic oil that will keep your motor up and running, Ford might have just the right thing for you. Endorsed by the Blue Oval and recommended by many big brands, it can be used both for the newest editions, and the earlier generations of the Powerstroke engine.

3. Valvoline – Best Engine Oil for 6.7 Powerstroke

Valvoline - 773780 Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA

Heavy-duty truck engines require a specific blend and a certain consistency to reach their full potential. And that’s exactly what you’ll get with the Valvoline Premium Blue oil. It supports long oil life thanks to TBN retention and advanced oxidation resistance. A quick note: Valvoline is a US-based company, and this oil is a 100% US-made product, designed with the American roads and the 6.7-lit V8 engine in mind.

I have to warn you, however, that if you’ve got a first- or second-generation Powerstroke under the hood, this oil might not do it much good. It will still work, of course, but won’t be as effective as with the more recent motors. Lasting lubrication, a reasonable price (this is a synthetic blend, not a full synthetic), and excellent customer support make up for that.

Product Rating
Longevity
5 / 5
Mileage
4.8 / 5
Value for money
4.9 / 5
Result
4.9
Pros & Cons
An excellent choice for heavy-duty trucks and SUVs
Premium oxidation resistance and shear stability
A 100% US-made product
Not the best choice for older engines

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Valvoline’s SAE 15W-40 diesel oil was manufactured for heavy-duty trucks and SUVs. So, if you’re driving a vehicle like that, don’t hesitate to check this product out. While it’s mostly suited for newer engines, you’ll get reliability, longevity, and strong protection for any motor.

4. Delo – Best Diesel Oil For 6.7 Powerstroke

Delo 400 SDE SAE 15W-40 Motor Oil - 1 Gallon Jug

Affordability is what puts this diesel oil apart from all the other lubricants on today’s list. As far as the cheapest high-grade oils go, Delo 400 is right there among the leaders. It reduces the operating costs, too. The lubricant was formulated using the company’s ISOSYN technology. It protects critical parts in the engine bay, thanks to high-performance additives. They also prevent deposit build-up and effectively disperse soot.

Moreover, this oil delivers excellent results with ultra-low, low, and normal sulfur diesel fuels. Be careful, though, as it might leak if not taken care of properly. This is a minor con, however, and shouldn’t stop you from putting Delo on your list of must-haves. Like the Shell Rotella oil, it arrives in a pack of three and should last for a year or so.

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Product Rating
Longevity
4.9 / 5
Mileage
4.8 / 5
Value for money
4.9 / 5
Result
4.9
Pros & Cons
Covers a wide range of sulfur diesel fuels
Implements the ISOSYN technology for protection
Available at a very affordable price
Might leak a bit (nothing too serious)

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Delo did an amazing job with this diesel oil. It takes proper care of the Powerstroke engine by implementing premium additives developed by Chevron. On top of that, it’s one of the least expensive oils for heavy-duty vehicles.

5. Lucas Oil – Best Diesel Oil for 6.7 Powerstroke Winter

Lucas Oil 10299-PK4 Synthetic 15W-40 CJ-4 Truck Oil - 1 Gallon Jug

This right here is one of the biggest and most respected brands. It’s famous for the outstanding line-up of oils, lubricants, and additives. With Lucas Oil, you’ll get top-notch longevity and durability. This product will keep the engine protected for up to 7K miles. More importantly, it’s 100% compatible with diesel and gas engines.

So, if you’ve got two different vehicles with different engines, this oil can “feed” them both. My only complaint has to do with poor packaging. Some shipments take a long time to arrive, while others have the jugs upside down.

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Product Rating
Longevity
4.9 / 5
Mileage
4.8 / 5
Value for money
4.7 / 5
Result
4.8
Pros & Cons
It doesn’t get bigger than Lucas Oil
Market-leading longevity and reliability
Can be used both for diesel and gas engines
Poor packaging

Best Synthetic Oil for Ford 6.7 Diesel

Expert Recommendations
Anthony Guma
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Reduced engine wear, improved efficiency, and protection against thermal breakdown are just some of this oil’s pros. It can be used for gas engines as well and keeps the motor clean for a very long time.

Buyer’s Guide

You don’t want to put random oil in your expensive Powerstroke engine and ruin it, right? Of course, you don’t! And that’s exactly why I made this Buyer’s Guide. With its help, you’ll learn everything there is to know about aftermarket oil. We’ll talk about viscosity, engine protection, the importance of additives, fuel efficiency, and more. But first, we’ll start by looking at the various oil types and figure out which one is best for the 6.7-lit diesel V8.

Oil Type

Did you know that there are four different kinds of oil available on the market? That’s right, and today we’re talking about the best synthetic oil. However, I still want to give you a quick summary:

Best Synthetic Oil for Ford 6.7 Diesel

  • Full Synthetic Oil. If you do a lot of towing – say, go out camping, or do construction work – pure synthetic oil will be the best investment. Originally, it was created for racing and rally cars that are forced to handle high loads and extreme RPMs. This lubricant is also good for off-roading but isn’t very cheap.

  • Blended Synthetic Oil. Next, we have a lower-priced option that will still keep the engine nice and healthy throughout on the toughest trails. Blended synthetic includes most of the additives and protective elements from pure synthetic, but is mixed with the conventional type.

  • Conventional Oil. As you might’ve already guessed, conventional oil is the least expensive one. It is being used in most cars you see on the road. And, unless you’re planning on doing competitive racing or something like that, this oil will be an ok purchase. Conventional oil lasts for up to 5K miles before a change is required.

  • High-Mileage Oil. Older engines require special care – that’s why the high-mileage oil exists. It treats old motors properly and increases their lifespan.

Viscosity

As the experts claim, viscosity is the defining aspect of any oil, and I agree with that statement. A lot of heavy-duty truck and SUV owners don’t really understand what it’s about. Without getting into techy stuff, let me just say that different vehicles have various consistency ratings. Gas engines are nothing like diesel motors in this regard, so, we’re not gonna focus on them.

For diesel, the viscosity rates are 15W-40 and 5W-40. The number after the W (it means winter) in the middle represents the thickness of the oil when it’s working in the “routine mode”. I’m talking about summers and springs. The letter that you see first (like 15 or 5) defines the oil thickness when the temperature drops below zero.

Additives and Protection

Best Synthetic Oil for Ford 6.7 Diesel The term “additives” is used to describe elements that keep the engine in a good shape and protect it from contaminants. Sludge formation, deposit buildup, acidity, oxidation – those are just some of the things that additives safeguard the motor from. Rust and corrosion can be a big issue as well, along with foaming and extreme weather conditions. Yes, powertrains are known to produce a lot of waste that needs to be taken care of.

Now, it’s very important to remember that diesel and gas engines are different from each other. So, make sure that you’re getting oil that was specifically designed for (heavy-duty) diesel engines. Otherwise, you’ll cause more harm than good, wearing out the motor and decreasing its lifespan.

Efficiency

The #1 task of any lubricant is to keep metal-to-metal contact in the engine to a minimum. And if the oil meets the requirements/recommendations of famous brands, that means it’s efficient enough and can be trusted. Next, I want you to check the specs for any mileage gains. That’s right: good-quality oil improves fuel economy (by up to 2%), and that can be a significant gain in the long run.

Shear stability is also very important: it is resistance, natural protection against viscosity loss during extreme temperatures.

Best Synthetic Oil for Ford 6.7 Diesel (Updated June, 2021)

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Editor’s Choice

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil

1) Shell Rotella T6 5W-40 Diesel

  • Best Features:
    – Improves fuel efficiency of the 6.7-lit engine
    – Superb extreme low/high temp protection
    – Available in different volumes and containers
  • Size: 1 Gallon, Pack of 3
  • Motor Oil Viscosity: 5w-40
  • Type: Full Synthetic

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Genuine Ford Fluid XO-15W40-5QSD SAE 15W-40 Super Duty Diesel Motor Oil

2) Ford 15W-40 Super Duty Diesel Motor Oil

  • Best Features:
    – Recommended by Ford engineers for the Powerstroke
    – Meets the requirements of leading brands
    – Works both with newer and older engines
  • Size: 5 Quart
  • Motor Oil Viscosity: 15w-40
  • Type: Synthetic Blend
  • Available Options:
    Ford 5w40 diesel oil

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Valvoline - 773780 Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA

3) Valvoline – 773780 Premium Diesel Engine Oil

  • Best Features:
    – Specifically designed for heavy-duty vehicles
    – Oxidation resistance and shear stability
    – Manufactured in the States for American drivers
  • Size: 3 Gallons
  • Motor Oil Viscosity: 15w-40
  • Type: Synthetic Blend

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Delo 400 SDE SAE 15W-40 Motor Oil - 1 Gallon Jug

4) Delo 400 SDE SAE

  • Best Features:
    – Equally good with ultra-low and normal sulfur fuels
    – Formulated using the ISOSYN technology
    – Arguably, the cheapest premium oil out there
  • Size: 3 Gallons
  • Motor Oil Viscosity: 15w-40
  • Type: Full Synthetic

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Lucas Oil 10299-PK4 Synthetic 15W-40 CJ-4 Truck Oil - 1 Gallon Jug

5) Lucas Oil 10299-PK4

  • Best Features:
    – One of the biggest brands of aftermarket oil
    – Superb quality: lasts for a long time
    – Also compatible with gasoline engines
  • Size: 4 Gallons
  • Motor Oil Viscosity: 15w-40
  • Type: Full Synthetic

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Conclusion

Back in the day, you had to change your oil every 3K miles or so to keep the engine healthy. However, thanks to modern-day lubricants, that interval has pretty much doubled (it varies between 5K and 7K miles, depending on the motor). And it’s very important to get the right kind of oil for optimal performance. Over time, corrosion takes over the engine, causing it to malfunction, and, eventually, break down.

Well, that won’t be a problem if you purchase one of the oils that we checked out today. These motor oils will be money well spent, as they’ll help get rid of sludge and particles, not to mention mileage and save you money in the long run. Drive safely, only invest in premium lubricant, and keep your eyes on the road!

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