2019 International LT Oil Capacity & Filter Guide

The 2019 International LT requires between 30 and 44 quarts of oil, depending on the engine option.

Quick Answer

• Oil Capacity: 30–44 quarts (28.4–41.6 liters)
• Recommended Oil Weight: 10W-30 or 15W-40 CK-4
• Oil Specification: API Service CK-4
• OEM Oil Filter: Consult dealer for Navistar/Fleetrite part number based on VIN.
• Aftermarket Filter Cross-Reference: WIX 57746XD, Fram L45941, Luber-Finer LFP9001

Capacity by Engine Option

Oil Change Interval

The oil change interval for a 2019 International LT depends heavily on the engine, fuel consumption, idle time, and operating conditions. Modern engine control modules (ECMs) use this data to calculate the optimal change interval.

• Normal Duty: For the Cummins X15, intervals can be as high as 60,000 miles or more under ideal conditions (low-idle, on-highway use) when using an oil analysis program to monitor oil condition. The International A26 may also reach extended intervals. Always follow the manufacturer's onboard oil life monitoring system.
• Severe Duty: For vehicles in construction, vocational applications, or with high idle time, expect much shorter intervals. A typical severe-duty interval might be 25,000–35,000 miles or determined by oil analysis. Do not exceed manufacturer recommendations.

Drain Plug Torque

Proper torque is critical to prevent leaks or damage to the oil pan.

• Cummins X15 Drain Plug Torque: 60 ft-lbs (81 Nm)
• International A26 Drain Plug Torque: 50 ft-lbs (68 Nm)

Note: Always use a new drain plug sealing washer with every oil change to ensure a proper seal.

How to Change the Oil (Simplified)

Changing the oil on an LT is straightforward but requires the right tools and a large-capacity oil drain pan.

1. Warm the engine to bring the oil to operating temperature, then shut it off.
2. Place a drain pan (minimum 12-gallon capacity) under the oil pan drain plug.
3. Remove the drain plug and allow the oil to drain completely.
4. While the oil is draining, locate and remove the spin-on oil filter(s) using a filter wrench.
5. Clean the filter mounting surface and ensure the old filter gasket was removed.
6. Lubricate the gasket of the new filter with fresh engine oil and install it. Hand-tighten until the gasket makes contact, then tighten an additional 3/4 to one full turn as per the filter manufacturer's instructions.
7. Install a new sealing washer on the drain plug and tighten it to the specified torque.
8. Fill the engine with the correct quantity and type of new engine oil.
9. Start the engine and let it run for a few minutes to circulate the new oil. Check for leaks at the drain plug and filter.
10. Shut the engine off, wait 15–20 minutes for the oil to settle, and re-check the oil level on the dipstick, topping off as necessary.

Common Issues / Tips

• Filter Access: The primary oil filter is typically located on the driver's side of the engine block and is a large, spin-on cartridge. Access is generally good from underneath the truck.
• Oil Pan Material: The Cummins X15 often uses a composite oil pan. Be extremely careful not to overtighten the drain plug, as this can crack the pan, leading to a costly repair.
• Resetting Oil Life Monitor: After the oil change is complete, be sure to reset the oil life monitoring system through the dash information display. Failure to do so will result in inaccurate change alerts.
• Oil Analysis is Key: For any fleet or owner-operator looking to maximize uptime and safely extend drain intervals, investing in a routine oil analysis program is highly recommended. It provides invaluable insight into the health of both the oil and the engine.

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