Mercedes Mullins
Adding blue diesel exhaust fluid (DEF) to a Duramax engine is a straightforward process, but it's important to take certain precautions. DEF is typically stored in a tank located next to the fuel tank and identified by a blue cap. While DEF is safe and non-toxic, it should not be added to the fuel tank. Overfilling the DEF tank can cause issues as the fluid can freeze and crack the tank in cold weather. The amount of DEF needed depends on the engine model and usage patterns, with consumption directly linked to fuel consumption. Duramax engines made from 2011 to 2016 typically have a DEF capacity of 5 gallons, and it is recommended to refill every 1,500 to 3,500 miles.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| DEF Tank Location | Usually next to the fuel tank |
| DEF Tank Capacity | 5-7 gallons |
| DEF Consumption | 3% to 5% of fuel consumption |
| DEF Composition | 67.5% water and 32.5% automotive-grade urea |
| DEF Safety | Non-toxic, non-polluting, non-flammable, safe to handle and store |
| DEF Storage Temperature | Between 12°F and 86°F |
| DEF Shelf Life | 1-2 years |
| DEF Refill Frequency | Every 1,500-3,500 miles |
| DEF Fill Port Colour | Blue |
| DEF Brand Recommendation | AC Delco, BlueDEF |
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What You'll Learn
DEF is safe to handle and non-toxic
DEF, or Diesel Exhaust Fluid, is a solution composed of 67.5% water and 32.5% automotive-grade urea. It is an essential component of the SCR system in modern diesel engines, including Duramax engines, as it helps to reduce toxic nitrous oxide exhaust fumes. While it is primarily designed to be added to a separate DEF tank, you may be wondering if it is safe to add it to your Duramax's fuel tank.
Rest assured that DEF is safe to handle and non-toxic. It poses no serious risk to humans, animals, or the environment. In fact, it is non-polluting, non-hazardous, and non-flammable. Even when exposed to extreme temperatures, DEF remains non-toxic. This is an important feature, as DEF can freeze at 12°F, which may be a concern for those in cold climates. However, freezing does not impact the start-up or operation of the vehicle, and it is still safe to handle even in its frozen state.
The non-toxic nature of DEF is due to its composition. As mentioned, it is primarily water, with a significant portion being urea. Urea is a common substance found in many products, including fertilisers and skincare products. While it is generally safe, it is important to note that urea can cause skin and eye irritation in some individuals. Additionally, it should not be ingested in large quantities, as it can act as a laxative.
The safety of DEF is further emphasised by its specific storage and handling guidelines. All hoses, fittings, and storage tanks must be made of DEF-approved materials, such as stainless steel, certain plastics, titanium, or EPDM rubber. This is to avoid chemical contamination of the DEF and potential damage to the SCR system. By following these guidelines, users can ensure the longevity and effectiveness of their DEF fluid.
While DEF is non-toxic, it is important to remember that it should only be used as directed. Adding DEF to the wrong tank or mixing it with other fluids can cause problems and may lead to costly repairs. Always refer to your vehicle's owner manual and the recommendations of DEF manufacturers to ensure proper use and storage.
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DEF tank capacity and location
The capacity of the DEF tank on a Duramax engine varies depending on the model year and engine type. Most Duramax engines made between 2011 and 2016 have a DEF capacity of 5 gallons, while the 6.6-liter Duramax engines made after 2016 have a capacity of 7 gallons. The 3.0-liter Duramax engine has a capacity of 5.4 gallons. The DEF tank capacity can also be found by checking the sticker inside the fuel door or referring to the owner's manual.
It is important to note that the DEF tank should not be overfilled, as it can cause problems with the system and lead to costly repairs. This is because diesel exhaust fluid is mainly water and can freeze in cold weather, causing it to expand and crack the DEF tank. Therefore, it is recommended to fill the tank up to the line or below it, especially when adding DEF in cold weather.
The DEF tank on a Duramax is typically located next to the fuel tank and can be identified by its blue cap with "DEF" written on it. The DEF gauge on the dash, usually located next to the fuel gauge, helps monitor the DEF levels. Additionally, warning messages such as "Add DEF" may appear on the dashboard when the DEF levels are low.
The DEF consumption depends on the environment, operation, and duty cycle of the equipment. On average, DEF consumption is between 3% to 5% of fuel consumption, and one gallon of DEF lasts around 300-500 miles. Therefore, a Duramax with a 5-7 gallon tank will need to be refilled every 1,500-3,500 miles. However, this estimate can vary based on driving conditions, such as city driving or highway driving.
It is also important to consider the shelf life of DEF, which is approximately two years. However, the fluid starts to degrade after the first year, so it is recommended to buy only the required amount of DEF and use it within a year.
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How to avoid overfilling the DEF tank
To avoid overfilling the DEF tank, it is important to know the capacity of your DEF tank. Most trucks have a DEF gauge or indicator to help you avoid overfilling. You can also visually inspect the DEF tank to check the fluid level. Look at the level through the translucent tank walls, where level markings will be moulded into the plastic tank.
It is recommended to fill the tank up to the maximum fill line without overfilling. Overfilling can cause spills and potential damage to the vehicle's paint or components. Diesel exhaust fluid is mostly water and can freeze in cold weather. If the fluid freezes, it can expand and crack the DEF tank. Therefore, it is important not to overfill the tank in cold weather.
DEF should be stored properly to maintain quality and effectiveness. It should be kept in a cool, dry place, away from direct sunlight, as heat can cause DEF to degrade more quickly. Always keep DEF in its original container, which is designed for proper storage, and ensure the container is tightly sealed when not in use to prevent evaporation.
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What to do if you add DEF to the fuel tank
Adding Diesel Exhaust Fluid (DEF) to the fuel tank can cause serious damage to the engine and fuel system. DEF is mostly water and can freeze in cold weather, which can cause it to expand and crack the DEF tank. Therefore, it is important to take immediate action if you accidentally add DEF to your diesel fuel tank.
Firstly, stop driving the vehicle and turn off the engine to prevent further damage. Next, secure the vehicle in a safe location, away from traffic or any potential hazards. Then, contact a professional mechanic or dealership for assistance. They will need to drain the fuel tank and flush the fuel system to remove the DEF. Depending on the extent of the damage, some components of the fuel system may also need to be replaced.
To avoid this problem, always store DEF and diesel fuel in separate containers and double-check the labels before adding anything to your vehicle. Consult your vehicle's owner manual or a professional if you are unsure about which tank to add DEF to.
It is also important to note that DEF consumption varies depending on the environment, operation, and duty cycle of equipment. On average, DEF consumption is 3% to 5% of fuel consumption. As fuel consumption increases, DEF consumption also increases. Therefore, it is important to consider the highest consumption rates when planning DEF delivery and storage.
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$32.45
How often to refill the DEF tank
The DEF capacity of a Duramax engine ranges from 5 to 7 gallons, depending on the model year and engine type. On average, one gallon of DEF will last between 300 and 500 miles, so a Duramax will need to be refilled every 1,500 to 3,500 miles. However, this is just a rough estimate, as the rate of DEF consumption depends on several factors, including the amount of diesel fuel in the tank, driving conditions, and the environment and operation of the equipment.
For example, if you do a lot of stop-and-go driving in the city, you will use up DEF faster than if you were driving on the highway. Additionally, the DEF system only uses a small amount of fluid each time it regenerates the DPF, so the DEF tank might not be empty when the fuel tank is empty. It is recommended to refill the DEF tank when it reaches around 30% to 50% capacity to prevent any issues with the system.
Some people prefer to wait until the warning message appears, which typically occurs when there are around 1,000 miles left until the tank is empty. However, this may vary depending on driving conditions and prior consumption. It is important to note that running the DEF tank dry can cause problems, as the fluid has a shelf life and should be used within a year to avoid degradation.
To keep track of your DEF levels, you can check the gauge on the dash or refer to the owner's manual for specific DEF tank capacity information. The DEF tank on a Duramax is usually located next to the fuel tank and can be identified by its blue cap with "DEF" on it. When refilling the DEF tank, it is important not to overfill it, as the fluid can freeze and expand in cold weather, potentially causing cracks in the tank and other issues.
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Frequently asked questions
Diesel Exhaust Fluid (DEF) is a non-toxic solution of 67.5% water and 32.5% automotive-grade urea. It is used to reduce NOx in the exhaust system.
You can check the DEF gauge on your dash to monitor the DEF level. When it is low, you will also get a message on the dash saying "Add DEF".
DEF capacity in a Duramax engine ranges from 5-7 gallons. On average, one gallon of DEF will last 300-500 miles, so you will need to refill every 1,500-3,500 miles.
You can purchase DEF from auto parts stores, truck stops, Walmart, and farm stores. Be sure to choose a certified, reputable manufacturer and check the date code before buying.
