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Can You Run 15w40 in a 6.7 Powerstroke? (Explained)

The 15w40 is an excellent power-producing diesel oil compatible with most diesel engines. It is compatible with cargo trucks, small diesel trucks, and gasoline engines. It will be fine and work best on these vehicles. Additionally, this oil also works as the previous API oil.

If you used the API oil and didn’t know which one is the best fit, 15w40 is for you. But will it be a great fit for different engines and different Powerstroke too.

Can you run 15w40 in a 6.7 Powerstroke?

You can run 15w40 in a 6.7 Powerstroke. Here the 6.7L diesel engine offers the most powerful 3rd generation engine. It provides better class power if you use the 15w40 oil. Whatever the size of your vehicle engine is, you can use this oil ideally without damaging the engine’s health.

You will also find some other oils to use on your 6.7L Powerstroke. But the 15w40 would be the best one for some reasons. First off, this oil ensures the best fuel consumption and gives the engine the right amount of fuel. It’s not like ordinary fuel that your engine will consume more.

This engine oil has the best oxidation stability. Therefore, it will support the engine better than anything else. Moreover, the thermal stability is another notable feature of using 15w40 engine oil. You can use it safely in your 6.7L Powerstroke for its high characteristics.

Besides, the viscosity is another excellent feature of this 15w40 oil in 6.7L Powerstroke. You can use it to get the best fluid flow in your diesel engine, crucial for the 6.7L diesel engine. You will rarely find any other fuel with the best viscosity index like the 15w40 engine oil.

You will get the best fuel consumption from the 15w40 oil because of all the best features of this engine oil. You cannot expect a better choice than this engine oil since it perfectly goes with the 6.7L Powerstroke engine.

Is 15W-40 OK in 6.7 Powerstroke?

In a 6.7 Powerstroke, 15W-40 is ok to fit there because it is the most critical component to boost your engine performance that keeps you cool. In most cases, the synthetic used in the engine becomes brighter when the temperature drops to zero in ninety per cent of the engines.

For this, its ratio can match very well with the engine. That sounds like it is for hotter environments. Assuming you live in an occasional region with cold winters, you could need a slenderer oil in the colder time of year.

The higher the number, the thicker the consistency for hot regions. Despite being viewed as perhaps the most solid diesel motor at any point put in a light-obligation truck, the engine was not without its issues.

So, the vehicle can use that 15W-40 in 6.7 Powerstroke to keep all these things in balance, and it fits.

Can I use 15w40 instead of 10w30 in my 6.7 Powerstroke?

You can use 15W-40 instead of 10W-30 in your 6.7 Powerstroke because nothing wrong can be said about utilizing a 15w-40, yet it will affect your mileage.

With your well-conceived plan to tow infrequently, the advantage of a lighter grade for day to day driving would offset any apparent gamble of the towing issues.

It is the creation of the base oil and added elements that safeguard your motor from wear, ash, and corrosiveness. Since 10W-30 is lighter than 15W-40 oil, its internal energy may be extra fragile, and it thoroughly can be extra willing to oxidate.

Consequently, excellent added elements are expected to make up for those shortcomings for 10W-30 motor oil to safeguard too and keep going up to a 15W-40. Magnificent 10W-30 oils can continue and are superior to industry-standard 15W-40 oils.

So, you can use 15W-40 instead of 10W-30 in your 6.7 Powerstroke without minor inconsistencies.

3 reasons why you can run 15w40 in 6.7 Powerstroke

You can run 15w40 in 6.7 Powerstroke because of three reasons. Characteristics, high quality, and year-round using capabilities. These three reasons will show you why you should use this oil in your 6.7 Powerstroke and other engines.


The 15w40 has some distinct characteristics for which you can securely use this oil in your 6.7L Powerstroke. The viscosity index is the best feature of this oil. You can get the best fuel flow from the engine.

Also, the fluid is beneficial to give your engine the best support and power-producing capability. Your motor will burn the fluid efficiently, and you will get the best optimum use.


Another reason you can use the 15w4 engine oil is its quality. It is one of the best diesel fuels compatible with the others. You can use it for your different vehicles and give the best support.

High-quality fluid is recommended for two reasons. It gives you an economical choice since the engine will produce optimum power, and it will enhance the engine life and give you the best quality engine for a long time.

Year-Round Usage:

You cannot use every oil in all weather. Some may be good for winter; others might be suitable for the summer. Very few oils are available for year-round usage. Here comes the 15w40. You can use it everywhere under any weather.

So, year-round usage is the last reason you can use the 15w40 in 6.7L Powerstroke.

What oil is recommended for 6.7 Powerstroke?

You will find different recommended oils for your 6.7 Powerstroke. But you must choose the oil approved or recommended by FORD; they can give you the best compatible oil recommendations better than anyone else.

We find four different engine oils for your 6.7 Powerstroke to give you the best support in various conditions.


The 10w30 is a recommended oil for 6.7L Powerstroke. It will be the best for those who use a minimal amount of oil and don’t drive too often or daily. If you’re one of them, the 10w30 is for you. It will be better for your light use.

Maybe you have the car, but you use it occasionally. In that case, you should go for the 10w30 to get the best result and best output accordingly.


The 15w40 is also a recommended oil for 6.7 Powerstroke. You can use it in any situation, but it is suitable for rough use.

If you use your car regularly and go for the long drive, you should use the 15w40. It can bear the most pressure and give you a solid solution.


Another recommended engine oil for your 6.7 Powerstroke is 5w40. You can use it instead of the 15w40.

They both are excellent in quality and will last for a long time. If you have any issues with long-lasting engine oil and are a regular user of it, you should use the 5w49 engine oil.


Another best synthetic engine oil is CJ-4. You can expect to use this oil for about 30000 miles. That’s the best part of this engine oil. You can securely use this oil on your 6.7 Powerstroke. It will be a great fit and will be a great engine fluid.

How often should I change the oil in my 6.7 Powerstroke?

You Should change the oil in your 6.7 Powerstroke after 10000 miles. If you drive 10000 miles a year, you should change the oil every year. It’s not constant and will vary from user to user. But the ideal practice of changing the oil is 10000 miles.

You can also change it in 20-30 thousand miles that most manufacturers suggest, but I prefer to change my existing oil every 10000 miles. If you drive 10000 miles in six months, you should change the engine oil.

If you have high-quality engine oil and use the car too much, you can also change the oil after 25000 miles. It would be better not to rely on the manufacturer’s words but your experience. If you find any difficulties after running for 10,000 miles, you must change the oil.

Final Thoughts

You can run 15w4 oil in 6.7 Powerstroke; it will be a great fit and give you the best power from the engine. It has high index viscosity, is compatible with every season, and will fit most diesel engines. You can efficiently run the engine for all these reasons because of quality features.