All Season Engine Oils: Best Oils For 6.7 Powerstroke Diesel

When considering Best Oils For 6.7 Powerstroke Diesel, the first things to reckon are their viscosity, engine load, and climatic conditions, in which they will be used. Today there are many engine oils from different manufacturers and with different viscosity indexes. To find the best option for 6.7 Powerstroke Diesel, we will have to go into the details of each oil separately. At once we will notice that there is nothing complicated about these indexes. They are usually all-season, different in some physical properties and operating temperatures.

The main engine oils for 6.7 Powerstroke Diesel are 5W-40 and 15W-40, which implies the intensive operation of the engine, for which it’s actually built. Such oils are also perfectly suitable for industrial, agricultural, and marine applications. They protect the engine from premature wear, reduce friction, eliminate dirt particles, and friction residues.

Oils help maintain exhaust after-treatment systems that are designed to improve engine efficiency, fuel economy, and clean exhaust emissions. 

List of Top-Rated Best Oils For 6.7 Powerstroke Diesel

Shell Rotella T6 5W-40 Diesel Engine OilShell Rotella T6
5W-40 Diesel Engine Oil
Lucas Oil 10299-PK4 Synthetic 15W-40 CJ-4 Truck OilLucas Oil 10299-PK4
Synthetic 15W-40 CJ-4 Truck Oil
Motorcraft SAE 5W-40 Full Synthetic Diesel Motor OilMotorcraft SAE 5W-40
Full Synthetic Diesel Motor Oil
Delo 400 SDE SAE 15W-40 Motor OilDelo 400 SDE SAE
15W-40 Motor Oil
Valvoline Premium Blue SAE 15W-40 Diesel Engine OilValvoline Premium Blue SAE
15W-40 Diesel Engine Oil

Reviews of the Best Oils For 6.7 Powerstroke Diesel

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)

Shell Rotella T6 5W-40 is a fully synthetic diesel engine oil that works best on modern vehicles. With this oil, you will be able to protect engine parts and provide full protection against premature wear. This high-tech-based oil uses special additives that provide additional engine protection and help eliminate waste products and friction residues. The oil creates a reliable layer for certain engine elements. This layer maintains proper lubrication even at high temperatures.

The 5W-40 mark on the oil indicates its temperature properties and viscosity indexes. “5” indicates that the engine will be able to reliably turn the crankshaft at low temperatures down to -22F. However, at -49F, the oil freezes.

In fact, Shell Rotella T6 5W-40 is an all-season oil, perfect for moderate climate. According to the manufacturer, the oil improves fuel economy by about 1.5-2%. It should be noted that this oil provides no dirt or harmful vapors and reduces oxidation processes, completely eliminating corrosion. Thus, T6 is suitable for efficient exhaust systems that exclude harmful emission formation and can be used with modern exhaust control systems.


  • Excellent oil base with effective additives
  • Increased fuel economy 
  • Great washing properties
  • Suitable for vehicles with modern exhaust control systems
  • Provides exceptional engine protection at high temperatures


  • Manufacturer: Shell Rotella
  • Gallon capacity: 3,8 liters
  • Weight: 22.5 pounds

Shell Rotella T6 5W-40 is released in unique blue 3.8-l gallons. The set includes 3 gallons, which is quite enough for full replenishment. This is due to the fact that modern purely synthetic oils do not require frequent changes, especially when it comes to fairly new vehicles. With Shell Rotella T6 5W-40, you will provide full motor protection at both low and high temperatures.

What is the lowest temperature to start the engine using this oil?

The oil will allow you to start the engine at -22F. Lower ambient temperature will most likely not allow the engine to start.

What is the viscosity index of this oil?

The viscosity index in research conditions is set at 212F, as, in most cases, the engine operates at around 194F. This oil’s viscosity index is 12,6 (at 194F) and 16,3 (at 212F).



Motorcraft SAE 15W-40 is original diesel motor oil designed to ensure proper operation of 6.7 Powerstroke. This is semi-synthetic oil based on mineral and synthetic components. The combination allows achieving impeccable efficiency at a fairly low cost, compared to pure synthetic oils.

Oil viscosity is the most important indicator as it depends on how effective engine protection will be. If the oil is highly liquid at high temperatures, it will not coat the parts uniformly, and their wear will be more pronounced. For this reason, the oil must retain its binder properties at all temperatures, and this is exactly what Motorcraft SAE 15W-40 does. This oil has the highest viscosity indices among other motor oils of the company. At 100 degrees Celsius, the viscosity value is in the range of 12.5-16.3 (kinematic viscosity).

As for the lower temperatures, this oil is suitable for engine operation at -4F. It’s important that the oil shows excellent density at 59F, which indicates that it is universal, therefore, suitable for a moderate climate and does not require replacement during different seasons. The maximum recommended temperature of the product is 113F. Thus, the oil provides full lubrication of engine parts, reducing their wear, eliminating friction residues, and improving fuel economy. 


  • Original high-quality diesel oil by Ford
  • Unique additive package
  • Versatile temperature range
  • Great exhaust system protection


  • Manufacturer: Motorcraft (Ford)
  • Volume: 4.73 liters
  • Viscosity index: 15.6
  • Weight: 29.7 pounds
  • Made in the USA

Motorcraft SAE 15W-40 Diesel Motor Oil is ideal for modern vehicles with 6.7 Powerstroke, with assumed low exhaust emissions. It provides both improved engine protection and keeps the environment safe as well. The oil is sold in branded red 4.73-l gallons. Motorcraft SAE 15W-40 is universal, all-season, and semi-synthetic oil, designed specifically for Powerstroke engines.

How to change engine oil properly?

To change your oil in the proper way, the engine must be warm. Waste oil must be drained first, and the engine washed if necessary. When changing the oil (if you just refill it), pay attention to oil compatibility (the new product with the old one). Switching to another oil is best done at a service center.

Lucas Oil 10299-PK4 Synthetic 15W-40 CJ-4 Truck Oil – 1 Gallon Jug, Pack of 4

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

Lucas Oil 15W-40 CJ-4 is synthetic engine oil, designed for heavy-duty vehicles and pickup trucks. It is excellent for engines with high RPMs, including 6.7 Powerstroke Diesel. The oil meets many quality standards and works best with engines and systems approved after 2007. The oil shows great results with turbines and exhaust gas recirculation systems, providing adequate protection of engine components and reducing harmful emissions. However, the oil can still be used for cars produced earlier.

Lucas Oil 15W-40 CJ-4 has a kinematic viscosity around 14.6. As for temperature limits, it allows starting the engine at -4F. The oil retains its fluidity even at lower temperatures, with the freezing temperature being -38.2F. The oil is characterized by increased stability both at low and high temperatures. It reliably protects the engine and evenly lubricates its parts, offering great and long-time performance, without frequent changes.  


  • Designed for engines with high RPMs and heavy trucks
  • Perfect for exhaust gas recirculation systems
  • Complies with all security certificates
  • Maintains stability at high temperatures
  • x2 life compared to other conventional oils


  • Manufacturer: Lucas Oil
  • Viscosity index: 14.6
  • Volume: 128 oz
  • Weight: 31.5 pounds
  • Made in the USA

Lucas Oil 15W-40 CJ-4 is designed for more intense engine loads and heavy vehicles. This oil offers increased stability at different temperatures and significantly prolongs efficient engine operation without frequent changes. If you need reliable protection for your diesel engine, the 15W-40 CJ-4 is a great solution.

What is the capacity of one gallon in liters?

One gallon is 3,8 liters. The set includes 4 gallons.

Motorcraft SAE 5W-40 Full Synthetic Diesel Motor Oil

Motorcraft SAE 5W-40 Full Synthetic Diesel Motor Oil

Motorcraft SAE 5W-40 is a full-synthetic diesel engine oil for vehicles with Powerstroke engines. The oil offers stable operation at different temperatures and provides full protection of diesel engines in various trucks. Motorcraft SAE 5W-40 is an all-season product, although it’s best suited for cold climates. The highest ambient temperature is 95F. If the temperature is higher, the oil becomes too liquid, losing its viscosity and, consequently, its protective properties.

The oil provides perfect protection in severe cold. It does not freeze and maintains the necessary viscosity level to protect all active engine parts. It also has good anti-corrosion properties and eliminates rapid engine wear. The oil can be used at temperatures as low as -22 degrees Celsius. Thus, with Motorcraft SAE 5W-40, you get reliable 6.7 Powerstroke operation, providing its safety at heavy loads in severe cold.


  • Retains its fluidity in severe cold
  • Designed to precisely match stock oils 
  • Wide temperature range
  • Protects the engine at high temperatures


  • Manufacturer: Motorcraft
  • Viscosity: 13.73
  • Volume: 4.73 liters
  • Weight: 29.2 pounds
  • Made in the USA

Motorcraft SAE 5W-40 oil is designed for Ford trucks that are equipped with powerful engines and operate in cold regions. The oil allows starting the engine at -22F while maintaining fluidity. It’s supplied in red 4.7-l gallons. Motorcraft 5W-40 is the original Ford oil with perfect characteristics for 6.7 Powerstroke Diesel.

What is the difference between Ford 5W-40 and Ford SAE 15W-40 oils?

The main difference is in the temperature range, at which these oils retain their properties. Ford 5W-40 oil can withstand more severe low temperatures, while Ford 15W-40 oil allows you to start the engine at -4F.

Delo 400 SDE SAE 15W-40 Motor Oil – 1 Gallon Jug, (Pack of 3)

Delo 400 SDE SAE 15W-40 with ISOSYN Advanced Technology is designed for 6.7 Powerstroke engines, subjected to heavy and moderate loads. It is versatile in terms of its physical characteristics and is suitable for engines that meet the latest environmental standards. In addition, the oil works well in older vehicles, providing adequate engine protection and eliminating waste residues, generated by the friction of active engine parts. The oil maintains high density and maintains it at high temperatures. Using this oil, you will reduce the wear of engine components, provide reliable engine protection, and ensure fuel economy.

The oil is compatible with API CJ-4, API CI-4, API CI-4 Plus, and API CH-4 product standards. It maintains high stability at various extreme temperatures and allows you to safely start the engine at temperatures as low as -4F. The scope of application includes industrial engines, agricultural machinery, and marine vessels. In this way, you get professional motor oil with universal properties, which reliably protects diesel engines at heavy loads.


  • Meets lower CO2 emissions 
  • Works best with low sulfur fuels
  • Suitable for older engines as well as gas systems
  • Significantly reduces engine wear and improves fuel economy
  • Compatible with other oils of the same class


  • Manufacturer’s brand: Delo
  • Kinematic viscosity: 14.6
  • Volume: 3,8 liters
  • Weight: 23.9 pounds
  • Made in the USA

Delo 400 SDE SAE 15W-40 engine oil is developed according to a special technology, which allows obtaining a high-quality semi-synthetic substance, preserving the engine initial condition, and providing its lubrication in harsh weather conditions. The product is supplied in blue 3.8-l gallons. This set includes 3 gallons.

What does the “400 SDE” mark on the gallon mean?

This mark indicates that we have a semi-synthetic oil for various diesel equipment and 4-stroke engines of the API CK-4 service category.

Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3

Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3

Valvoline 15W-40 engine oil has a high resistance to oxidation. This means that it excellently protects the engine from corrosion and contamination. The oil not only reduces the friction of important engine parts, providing their proper lubrication but also “washes out” harmful waste residues. This significantly extends the life of the engine. Valvoline Premium Blue 8600 ES does not require frequent changes and can be used to provide excellent engine protection for quite a long time.

This oil is simply perfect for modern 6.7 Powerstroke Diesel engines that support exhaust gas recirculation and special filters. Valvoline Premium Blue can be used for diesel and gas engines that operate at low temperatures (down to -4F).


  • Increased oxidation resistance
  • Maintains impeccable engine cleanliness
  • Works great for emissions treatment equipped diesel engines
  • Perfectly copes with soot and eliminates contamination


  • Manufacturer: Valvoline
  • Kinematic viscosity: 14.8
  • Volume: 3,8 liters
  • Weight: 24 pounds
  • Made in the USA

Valvoline 15W-40 oil is a professional advanced product, used in high-performance engines. The oil is supplied in standard 3.8-liter blue gallons, and the set includes 3 gallons. This oil will provide reliable engine protection for almost any diesel engine with modern diesel engine technology.

Is Valvoline 15W-40 fully synthetic oil?

Valvoline Premium Blue 8600 SAE 15W-40 oil is semi-synthetic with a high-quality base and special additives that provide additional protection for the engine. 


It should be noted that 6.7 Powerstroke Diesel engines can use different types of oil, although it basically has similar top performance characteristics. The main difference is the lower index that defines the lowest temperature when the engine can be started. Of course, different oil behaves differently and its properties depend on the production technology, composition, and special additives. The most optimal option at high engine loads is 15W-40 oil. Although it doesn’t mean that other options are not applicable. Such oils are mainly designed for new vehicles but they also show great results in older engines.

Frequently asked question

What kind of oil goes in a 6.7 Powerstroke?

6.7 Powerstroke diesel engines support different engine oils, depending on the engine load and operating conditions. 10W-30 oil is suitable for normal conditions. Engine oils that have a different viscosity index at low temperatures can also be used if extreme engine loads are assumed or a bio-diesel engine is used. Thus, 5W-40 and 15W-40 oils are the optimal solutions for heavy engine loads. These oils have increased viscosity and density, keeping the engine safe at high pressure and friction.

What type of oil is best for Ford 6.7 diesel?

15W-40 is the best choice for a Ford 6.7 Powerstroke diesel. It’s versatile and all-seasonable. The oil has sufficient viscosity indexes to provide reliable engine protection at heavy loads. Most of these oils are also perfectly suitable for vehicles with exhaust gas recirculation systems and special cleaning filters. 15W-40 oils do not freeze in moderate cold or lose its viscosity at high temperatures.

What is the best synthetic oil for diesel engines?

Synthetic oils have good viscosity properties, low evaporation, and do not require frequent changes. The best synthetic products are Shell Rotella T6 and Lucas Oil 10299-PK4 Synthetic 15W-40 CJ-4 Truck Oil. The former has a viscosity index of 5W-40 and shows great results in severe frost. Lucas Oil has a viscosity index of 15W-40, which indicates its high stability and versatility. It’s suitable for powerful diesel engines in moderate climate conditions.

Can I put 15W-40 in my 6.7 Powerstroke?

This type of engine oil is recommended for use in 6.7 Powerstroke engines that are subjected to heavy loads. It can be a turbocharged system or not. The main feature of this oil is that it operates at -4F, and maintains its viscosity at high temperatures. Such oil usually features special additives, which extend the life of the engine, protecting it from premature wear due to increased density. For this reason, you can safely pour 15W-40 in your 6.7 Powerstroke if it’s compatible with your old engine oil, without creating any compounds harmful to the engine.

How much oil does a Ford F-350 6.7 eats?

The amount of oil that is needed when changing engine oil for an F-350 is approximately 13 quarts. This means that you will need about 12.3 liters of oil for a complete oil change. For this reason, many sellers offer sets with multiple canisters to ensure that you get enough oil for your 6.7 engine

Editorial Staff

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