2018 International LT Oil Capacity & Filter Guide

The 2018 International LT oil capacity varies depending on the engine. This guide provides detailed information on oil capacity, recommended oil type, filter part numbers, and maintenance tips for your 2018 International LT.

Quick Answer

• Oil Capacity: Varies by engine (see table below)
• Recommended Oil Weight: SAE 15W-40 (CK-4 or FA-4, depending on engine)
• Oil Specification: API CK-4 or FA-4
• Oil Filter (Popular Cross-References):
  • Consult dealer for OEM part number
  • Fram: Consult Fram catalog for specific engine
  • Wix: Consult Wix catalog for specific engine
  • Mobil 1: Consult Mobil 1 catalog for specific engine

Capacity by Engine Option

Oil Change Interval

Normal Duty: Typically 30,000 to 50,000 miles or 500 hours, whichever comes first. Refer to your owner's manual or maintenance minder system for exact intervals.

Severe Duty: If operating under severe conditions (e.g., extreme temperatures, heavy loads, frequent idling, dusty environments), consider shortening the oil change interval to 15,000 to 25,000 miles or 250 hours. Always consult your owner's manual for severe duty recommendations.

Drain Plug Torque

Cummins X15: Consult a Cummins service manual or dealer for the precise drain plug torque specification. It is crucial to use a calibrated torque wrench to prevent over-tightening and damage to the oil pan.

N13 SCR: Consult an International service manual or dealer for the precise drain plug torque specification. Always replace the crush washer with a new one to ensure a proper seal and prevent leaks.

Crush washers are typically single-use and should be replaced every oil change. Always confirm the correct size and material for your specific engine.

How to Change the Oil

1. Gather Supplies: New oil, oil filter, drain pan, wrench for drain plug, oil filter wrench, funnel, rags, safety glasses, gloves.
2. Warm Up Engine: Run the engine for a few minutes to warm the oil, allowing it to drain more thoroughly. Then, turn off the engine.
3. Position Drain Pan: Place the drain pan directly under the oil drain plug.
4. Remove Drain Plug: Carefully remove the drain plug with the appropriate wrench, allowing the old oil to drain completely. Inspect the crush washer and replace it.
5. Replace Drain Plug: Once all oil has drained, reinstall the drain plug and torque it to the manufacturer's specification.
6. Remove Old Oil Filter: Use an oil filter wrench to remove the old oil filter. Be aware that additional oil may drain out.
7. Prepare New Oil Filter: Apply a thin film of new oil to the gasket of the new oil filter.
8. Install New Oil Filter: Hand-tighten the new oil filter until snug, then tighten an additional 3/4 to 1 full turn, or as specified by the filter manufacturer (do not overtighten).
9. Add New Oil: Using a funnel, add the recommended amount and type of new oil to the engine.
10. Check Oil Level: Start the engine and let it run for a few minutes. Turn off the engine, wait a few minutes for the oil to settle, then check the oil level with the dipstick. Add more oil if necessary.
11. Dispose of Old Oil: Properly dispose of used oil and the old filter at a certified recycling center.

Common Issues / Tips for this Generation

• DPF and DEF Systems: The 2018 International LT, like many modern diesels, relies heavily on its Diesel Particulate Filter (DPF) and Diesel Exhaust Fluid (DEF) systems for emissions control. Using the correct CK-4 or FA-4 oil is critical for the longevity and proper function of these systems. Incorrect oil types can lead to DPF clogging and costly repairs.
• Oil Sampling: For fleet operators or owners interested in extending oil change intervals safely, consider implementing an oil analysis program. Oil samples can provide valuable insights into engine wear and oil condition, allowing for optimized maintenance schedules.
• Engine-Specific Maintenance: Both the Cummins X15 and N13 SCR engines have specific maintenance requirements. Always refer to the respective engine manufacturer's manual for detailed procedures and specifications.
• Filter Quality: Given the high demands on commercial truck engines, investing in high-quality oil filters is essential. Cheap filters can lead to premature wear and potential engine damage.

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