DEF, also known as diesel exhaust fluid, is a solution used to treat emissions from a diesel engine. While it is vital for the health of your diesel vehicle, you might be wondering if it can go bad. Let's take a look at what you can expect when it comes to DEF expiration.
DEF is a water-based solution that contains urea and deionized water. It is inevitable that it will freeze during the cold months, but it won't ruin the fluid itself. However, it is recommended to use DEF within 1-2 years to ensure optimal performance. DEF should be stored in temperatures ranging from 40-80 degrees Fahrenheit.
Since DEF is 2/3 water, it does have a long shelf life, but it does need to be stored at proper temperatures. In this article, we will discuss what you need to know about DEF expiration and how to apply it to your diesel vehicle. In addition, we will answer other frequently asked questions about DEF and diesel engines, so keep reading to learn more!
Does DEF Go Bad? [Inc. If Frozen]
DEF, or diesel exhaust fluid, is a water-based solution that contains urea and deionized water. It is used to treat emissions from a diesel engine.
The freezing point of DEF is approximately 12 degrees Fahrenheit, but it will not ruin the fluid itself if frozen. However, to increase its shelf life, it is a good idea to store it at temperatures ranging from 40-80 degrees Fahrenheit.
When stored properly, DEF has a shelf life of up to 2 years. However, it is recommended to use it within 12 months for optimal performance and to avoid contamination.
This is a fairly long shelf life, but it's not something that should be forgotten about. While it is rare, diluted DEF could cause performance issues.
What Happens If You Use Expired DEF?
If you use expired DEF, then you may notice a decrease in fuel economy and an increase in emissions. Additionally, your engine may go into "limp mode," which means that the engine will not run at its full potential.
If you're experiencing any of these issues, then it's time to add DEF.
What If DEF Is Frozen?
If DEF is frozen, it will not ruin the fluid itself, as it can be thawed and used again. If you have extra DEF, don't add any preservatives or additives to it. It is best to let the fluid thaw on its own and then use it as you normally would.
Can DEF Be Stored Outside?
However, while cold temperatures don't affect DEF, hot temperatures do. Therefore, if DEF is exposed to high temperatures for extended periods of time, it will break down.
DEF can be stored outside as long as it is in a cool, dark place. Do not expose DEF to direct sunlight or high temperatures, as this will cause the fluid to break down.
It is also important to keep the container the DEF is stored in clean and free of debris. Always check the manufacturer's recommendations for more information.
How To Add DEF
In order to apply DEF, there is a separate tank where your vehicle's fuel tank is. It will be labeled and will be next to the diesel fuel cap. The DEF tank will have its own cap and most likely be blue in color.
When it comes to topping off, you'll want to use the same grade of DEF that's already in your tank. It is also vital to not put DEF in the diesel tank, as this will contaminate the fuel and cause damage to your engine.
Take a look at the following video for a tutorial on adding DEF:
Is DEF Necessary?
DEF is necessary for all diesel vehicles equipped with an SCR system. This includes all light-duty and heavy-duty trucks manufactured after 2010.
If your vehicle is newer than 2010, then it most likely has an SCR system and will require DEF. However, if you're not sure, consult your owner's manual or contact your vehicle's manufacturer.
What Are The Benefits Of Using DEF?
There are many benefits of using DEF, but the most important one is that it helps to reduce emissions. By treating emissions from a diesel engine, DEF helps to improve air quality and protect the environment.
In addition, DEF can also help to improve fuel economy. So, not only is it good for the environment but it's also good for your wallet!
What Are The Drawbacks Of Using DEF?
The only real drawback of using DEF is that it can be expensive. However, when you consider the benefits of using DEF, the cost is worth it.
Additionally, some people may not like the smell of DEF. However, the smell is not harmful and will dissipate over time.
Lastly, DEF adds weight to a vehicle, so it's important to keep that in mind when carrying heavy loads.
Despite the few drawbacks, the benefits of using DEF far outweigh the negatives. If you have a diesel vehicle, then it's important to use DEF to help reduce emissions and improve fuel economy.
Can I Pee In The DEF Tank?
No, you should not pee in the DEF tank. The urea found in urine can damage the DEF and cause problems with the SCR system. It is better to err on the side of caution and not add anything to the tank that is not specified.
What Should I Do If I Run Out Of DEF?
If you run out of DEF, you will need to refill the tank as soon as possible. If the vehicle runs out of DEF, the vehicle's speed will be severely limited until more DEF is added.
DEF can be purchased at most auto parts stores, so it is easy to find a place to refill the tank. Be sure to follow the manufacturer's instructions for adding DEF to your vehicle.
Is A DEF Delete Illegal?
There is no definitive answer to this question, as the legality of a DEF delete will likely vary from state to state. Therefore, it is advisable to consult with a local automotive specialist or lawyer to find out if a DEF delete is legal in your area.
A DEF delete is a process that involves removing or disabling the SCR system on a diesel vehicle. Without the SCR system, the vehicle will produce more emissions. As a result, DEF delete is often an illegal modification.
While a DEF delete has some drawbacks such as increased emissions, it can also have some benefits. For example, DEF delete can improve power output. Therefore, it is important to weigh the benefits and drawbacks of a DEF delete before deciding whether or not to do it.
How Do You Clean A DEF Tank?
Over time, the DEF tank can become dirty and filled with sediment. This can cause problems with the SCR system and reduce the effectiveness of DEF.
To clean the DEF tank, you will need to flush it out with distilled water. Start by adding a few gallons of water to the tank and then driving around for a bit to slosh it around. Next, add a few more gallons of distilled water and repeat.
Finally, add a gallon of distilled water to the tank and let it sit for a few hours. This will flush out all of the sediment and dirt from the tank.
Be sure to clean the DEF filter as well. The filter can be cleaned by removing it and spraying it with a hose. Be sure to allow the filter to dry completely before reinstalling it.
Final Thoughts
DEF is an important part of diesel engines, and it plays a crucial role in reducing emissions. By using DEF, consumers can help to improve air quality and protect the environment. In addition, DEF can also help to improve fuel economy.
It is important to follow the manufacturer's instructions for adding DEF to your vehicle. Also, keep a close eye on the level of DEF in the tank and refill it when necessary.
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