International DT (or Navistar DT) engines are known throughout the world for their dependability. Whether you have a truck, tractor, or bus with an International DT408 engine, you know that you have a decent motor. That said, you may also be wondering how to change the oil of your International DT 408 and the oil capacity. You have come to the right place.

What is the International DT408?

The DT408 is a New Generation Diesel (NGD) engine that was similar to the popular International DT466. The difference between the DT466 and DT408 was the size of the cylinder kit, with the 408 being the smaller of the two at 6.7L and destroked. They were used for about two years during the early 1990s, predominantly in buses. Within the DT family, the DT408 is in the mechanical injection category, alongside the DT360.

What is the Oil Capacity of the International DT408?

The International DT408 engine is 6.7L and has an oil capacity of 14 liters or 15 quarts. If you are using a truck or bus within severe driving conditions, changing the 14L of diesel engine oil out every 10,000 to 12,000 miles is highly recommended. In better driving conditions, you can change your oil about every 12,000-15,000 miles. Remember to change the oil filter, as well, typically around 500 hours of operation for each filter. If you notice signs of a bad oil filter—sputtering, metallic noises, dirty exhaust, low oil pressure—sooner than 500 hours, check the quality of your diesel oil before changing out the filter.

How Do You Change the Oil in the International DT408?

Now that you know when to change the oil in a DT408 engine and how much oil will be needed, let’s discuss how to conduct an oil change. If you have experience changing the oil in a diesel engine, you will find that the DT408 does not deviate from the standard procedure.

To begin, you will need the following materials and tools:

  • 14 liters/15 quarts of 15W40 engine oil
  • Compatible oil filter for the DT408, such as the WIX51799
  • Oil filter wrench
  • Wrench or ratchet and socket for drain plug
  • Container large enough to catch 15 quarts of oil
  • Funnel
  • Clean rags or towels to wipe up oil spills

Steps to Changing Oil in a DT408

Prior to draining the oil, you will want to run the vehicle for a short period, around 10 minutes. This allows the oil to cycle through the engine, gathering up any debris, and for the oil to flow more quickly back to the reservoir. Wait for the engine to cool slightly before proceeding to work. The engine oil may be hot to the touch if you begin too soon.

Next, follow these steps:

  1. Find the drain pan on your DT408.
  2. Position the container for the old oil under the drain pan.
  3. Pick up your wrench or ratchet and socket and loosen the oil drain plug.
  4. While the oil is draining, you can change out the oil filter for the new one.
  5. Once the old oil is in the container, return the drain plug and tighten it.
  6. Find the oil dipstick. This is where you will pour in the fresh oil. Grab your 15W40 and pour in the 15 quarts. Screw back on the cap.
  7. Begin the engine and let the new oil circulate. Listen for any abnormalities in the operation, and if everything is okay, turn the engine off and let it cool for 5-10 minutes.
  8. Check the oil level. Top off if needed.

Final Thoughts on International DT Oil Change and Capacity

There you have it—the oil capacity and changing method for the International DT408 diesel engine. These engines may not be in production anymore, but you can still find them on the market in used vehicles. Keep this guide in mind so you can easily change the oil when maintenance is necessary.


Hi, I’m Alastair. Welcome to, a website for the best oil recommendations for your vehicle, whether it is a two-door sports car, SUV, hatchback, or tractor. Having grown up on a family farm and working as an engineer, I became interested in just about anything with an engine. I also found that motor oil, despite being essential for internal combustion engines, is overlooked, underestimated, or just misunderstood. There may come a day when motor oil is obsolete as electric vehicles become more and more popular. But until then, you are going to need to know the best type of motor oil for your vehicle. That is why I was inspired to create this website. aims to be the internet’s destination for everything related to motor oil, including news, comparisons, features, and recommendations for vehicles by make and model. All the information you need to keep your treasured vehicles running clean is right here. In particular, I am also obsessed with the upkeep of vehicles in general. That is why you will also find troubleshooting tips for removing oil filters and drain plugs, for example. Consider it the mission of to provide accurate information, as well as insight for automotive professionals and enthusiasts.


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