2019 International MV Transmission Fluid & Service Guide

Quick Answer

• Transmission Make/Model: Allison 3000 Series (common in this application)
• OEM Fluid Spec: Allison TES 668™ (recommended for newer transmissions), or TES 295® (older spec, still acceptable but TES 668 is preferred)
• Drain & Fill Capacity: Approximately 19-22 quarts (varies by pan depth and cooler size)
• Full Overhaul Capacity: Approximately 29 quarts (varies by pan depth and cooler size)
• Filter OEM Part Number: Verify with dealer or service manual as multiple options exist based on transmission configuration.
• Recommended Service Interval:
  • Normal Duty: 48 months or 150,000 miles, whichever comes first.
  • Severe Duty/Towing: 24 months or 75,000 miles, whichever comes first.

Fluid Type Explained

The 2019 International MV, especially when equipped with an automatic transmission, commonly features an Allison 3000 Series transmission. For these robust workhorses, the correct transmission fluid is paramount for longevity and performance. Allison specifies their own fluid standards: TES 668™ and TES 295®.

Allison TES 668™: This is Allison's latest and most advanced fluid specification. TES 668 fluids are designed to offer superior performance, extended drain intervals, and enhanced protection against wear and oxidation compared to previous specifications. If your International MV has an Allison 3000 Series, using a TES 668-approved fluid is the best choice for optimal transmission health.

Allison TES 295®: While not as new as TES 668, TES 295 was Allison's premium fluid specification for many years. Fluids approved under TES 295 still provide excellent protection and are fully synthetic. If a TES 668 fluid is unavailable, a TES 295 fluid is an acceptable alternative, though switching to TES 668 is recommended when possible for enhanced benefits.

It's crucial to use only fluids that explicitly state compliance with either Allison TES 668™ or TES 295® specifications. Using generic or non-approved ATF can lead to premature wear, poor shifting, overheating, and ultimately costly transmission failure.

Service Procedure

Maintaining the transmission fluid in your 2019 International MV is a critical part of its overall maintenance schedule. There are two primary service procedures: a drain and fill, and a full fluid exchange (or flush).

Drain & Fill: This involves draining the fluid from the transmission pan, replacing the filter(s), and refilling with new fluid. This method replaces only a portion of the total transmission fluid, as a significant amount remains in the torque converter, cooler lines, and cooler. For the Allison 3000 Series, a drain and fill typically replaces around 19-22 quarts. While simpler and less expensive, it doesn't completely remove all old fluid. It's an acceptable method for routine maintenance, especially if performed at recommended intervals with quality fluid.

Full Fluid Exchange (Flush): A full fluid exchange uses specialized equipment to completely remove all the old fluid from the transmission system, including the torque converter and cooler lines, and replace it with new fluid. This method ensures that nearly 100% of the fluid is new. For the Allison 3000 Series, this can take approximately 29 quarts. While more thorough, it's generally more expensive and may not be necessary at every service interval if regular drain and fills are performed. Some manufacturers caution against power flushing older, neglected transmissions, but with proper equipment and procedure on a regularly maintained unit, it is the most effective way to ensure clean fluid throughout.

For a 2019 International MV with an Allison 3000 Series, it's often recommended to perform a full fluid exchange at longer intervals, perhaps every second or third fluid service, or to alternate between drain and fill and full exchange if the vehicle operates in severe conditions.

Service Interval

The service interval for your 2019 International MV's Allison 3000 Series transmission depends heavily on its operating conditions.

Normal Duty: For vehicles operating under typical conditions, such as highway driving with moderate loads, the recommended service interval is 48 months or 150,000 miles, whichever comes first.

Severe Duty/Towing: If your International MV is frequently used for heavy towing, operates in stop-and-go traffic, experiences high ambient temperatures, hauls unusually heavy loads, or is subjected to frequent power take-off (PTO) operation, it falls under severe duty. In these cases, the service interval should be shortened to 24 months or 75,000 miles, whichever comes first. Adhering to the severe duty schedule is crucial to prevent premature wear and maintain transmission efficiency.

Regularly checking your transmission fluid level and condition between services is also recommended. Look for proper fluid level (with the engine running and transmission at operating temperature, on level ground, in neutral or park depending on the dipstick marking), and check for clarity, color (should be reddish, not dark brown or black), and any burnt smell.

Common Transmission Problems for This Generation

While Allison 3000 Series transmissions are known for their durability and reliability, especially in commercial applications, some common issues can arise, often related to maintenance or operational stressors:

• Overheating: This is a major culprit for transmission damage. Overheating can be caused by low fluid levels, old or degraded fluid, clogged coolers, heavy loads, or sustained high-speed operation. Symptoms include delayed shifts, slipping, or a "hot" smell. Regular fluid and filter changes, especially with TES 668 fluid, significantly mitigate this risk.
• Delayed or Harsh Shifting: This can be indicative of several problems, ranging from low fluid pressure, worn clutches, faulty solenoids, or issues with the transmission control module (TCM). Proper fluid levels and quality are essential for smooth operation.
• Slipping: When the transmission struggles to engage a gear or the engine RPMs rise without a corresponding increase in vehicle speed, it's usually a sign of slipping. This can be due to worn clutch packs, low fluid pressure, or internal hydraulic leaks.
• Fluid Leaks: Seals and gaskets can degrade over time, leading to leaks. While sometimes minor, fluid leaks can quickly lead to low fluid levels and consequent damage. It's important to address any leaks promptly.
• Torque Converter Issues: Although less common with proper maintenance, torque converter problems can manifest as shudders, stalls, or a lack of power. Often, these issues can be exacerbated by poor fluid quality or infrequent changes.

Early detection and timely service are key to preventing minor issues from escalating into major, costly repairs. Pay attention to any changes in your truck's driving characteristics or dashboard warning lights.

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