2021 International LT Oil Capacity & Filter

Your 2021 International LT needs between 32 and 44 quarts of oil, depending on which engine it has.

Quick Answer

• Oil Capacity: 32–44 quarts (30.3–41.6 liters)
• Recommended Oil Weight: 10W-30 or 15W-40, depending on climate
• Oil Specification: API CK-4
• Oil Filter (International A26 Engine): OEM: Consult dealer; Aftermarket: Fram K10857, Wix 57792, Mobil 1 M1-702
• Oil Filter (Cummins X15 Engine): OEM: Consult dealer; Aftermarket: Fram K11266, Wix 57743XE, Mobil 1 M1-901

Capacity by Engine Option

Oil Change Interval

For the 2021 International LT, the oil change interval depends heavily on your driving conditions.

• Normal Duty: For trucks running mostly highway miles with light to moderate loads, an oil change interval of up to 50,000 miles (80,000 km) is possible, but always consult your owner's manual and oil analysis program for the most accurate information.
• Severe Duty: If your truck is frequently in stop-and-go traffic, idling for long periods, or hauling heavy loads in extreme temperatures, a more conservative interval of 25,000–35,000 miles (40,000–56,000 km) is recommended.

Drain Plug Torque

Always tighten the oil drain plug to the manufacturer-specified torque to prevent leaks.

• Drain Plug Torque: 37 ft-lbs (50 Nm)
• Crush Washer: Always use a new crush washer with every oil change to ensure a proper seal.

How to Change the Oil

1. Run the engine for a few minutes to warm the oil.
2. Place a large drain pan under the oil pan and remove the drain plug.
3. Allow all the old oil to drain completely.
4. Remove the old oil filter. Be prepared for some oil to spill.
5. Apply a thin layer of new oil to the gasket of the new filter and install it.
6. Reinstall the drain plug with a new crush washer and torque to specification.
7. Fill the engine with the correct amount of new oil.
8. Start the engine, let it run for a minute, then shut it off and re-check the oil level, adding more if necessary.

Common Issues / Tips

The 2021 International LT is a robust truck, but there are a few things to keep in mind for a long service life:

• Oil Analysis: For a fleet or an owner-operator, regular oil analysis is a wise investment. It can help you safely extend drain intervals and catch potential engine problems before they become catastrophic failures.
• Fuel Dilution: Both the A26 and X15 engines can be susceptible to fuel dilution of the oil, especially with a lot of idling. If you notice your oil level rising or smelling of diesel, it's time for an oil change and a check of your fuel system.
• Aftermarket Filters: While many aftermarket filters are high quality, always ensure they meet or exceed OEM specifications. A failed filter can lead to engine damage.

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