TriboDyn TRI-EX™ 75W-90 Limited Slip Full Synthetic Gear Oil with Friction Modifier
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TriboDyn TRI-EX 75W-90 is a full synthetic limited slip gear oil with the friction modifier already blended in. Unlike most competing oils that require you to purchase and add a separate friction modifier, TRI-EX delivers everything you need in one bottle for smooth, chatter-free performance in limited-slip differentials.
This full synthetic formulation forms a protective layer on gear and bearing surfaces while the built-in friction modifier eliminates chatter and shudder during low-speed turns. Extreme pressure additives provide exceptional shock and high-load protection. Meeting or exceeding API GL-5, API MT-1, MIL-PRF-2105E, Eaton PS-386, Mack GO-J/GO-H, and Meritor O-81/076N/076M specifications, TRI-EX reduces operating temperatures, extends gear and bearing life, and can even improve fuel mileage.
Key Benefits:
- Full synthetic 75W-90 with friction modifier already blended in — no additive needed
- Eliminates chatter and shudder in limited-slip differentials
- Excellent extreme pressure and shock load protection
- Reduces operating temperatures under heavy loads
- Extends gear and bearing life
- Suitable for limited-slip differentials, positraction units, manual transmissions, and transfer cases
Recommended Applications: Ideal for limited-slip differentials in trucks, SUVs, performance cars, and off-road vehicles. Perfect for towing, heavy loads, off-roading, or anyone seeking smoother, quieter differential operation without the hassle of adding a separate friction modifier.
Technical Specifications – TriboDyn® Tri-Ex 75W-90 Limited Slip Gear Oil
Viscosity @ 100°C (ASTM D445): 15.71 cSt
Viscosity @ 40°C (ASTM D445): 103.80 cSt
Viscosity Index (ASTM D2270): 164
Pour Point (ASTM D97): -38°C (-37°F)
API Gravity (ASTM D4052): 34.1
Recommended for use where the following specifications are required:
API GL-5, API MT-1, MIL-PRF-2105E / MIL-PRF-2105D, Mack GO-J, GO-H, PG-2 Limited Slip Differentials
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Why TriboDyn TRI-EX 75W-90 Limited Slip Outperforms All Other Gear Oils
Eliminates Chatter & Shudder
Built-in friction modifier is factory-blended for limited-slip and positraction differentials, delivering smooth, quiet operation and preventing annoying chatter during turns and acceleration.
Premium Factory-Blended Limited Slip Additive
No separate friction modifier or limited slip additive is needed — the premium Limited Slip Additive is professionally blended in at the factory for perfect performance in limited-slip/positraction differentials right from the first fill.
Extreme Shock & High-Load Protection
Advanced sulfur-phosphorus EP additives provide superior protection under heavy towing, high torque, and shock loading conditions common in trucks, SUVs, and performance vehicles.
Cooler Operation & Longer Gear Life
Reduces operating temperatures while significantly extending gear and bearing life, lowering maintenance costs and improving overall efficiency and fuel mileage.
Verified Reviews
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Meets or Exceeds Demanding Industry Specifications
API GL-5 • API MT-1 • MIL-PRF-2105E/D • Mack GO-J/GO-H • Meritor O-81 • Eaton PS-386 • Built-in Friction Modifier • TRI-EX™ Technology Treats the Metal
100% Customer Satisfaction
Hundreds of 5-star reviews • Perfect 100% rating on eBay for over 5 years. You are buying the worlds best oil, our shipping speed, packing, and service is 2nd to none.
Made in the USA
Exclusively manufactured in our own ISO 9001 certified facility. Unmatched purity and quality in every drop.
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Safety Data Sheet (SDS)
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Frequently Asked Questions
It is specifically engineered with a factory-blended friction modifier and proprietary TRI-EX™ technology that treats the metal surfaces, not just the oil. This eliminates chatter and shudder in limited-slip/positraction differentials while delivering superior extreme-pressure protection.
Yes. The built-in friction modifier is designed to provide smooth, quiet operation in positraction and limited-slip differentials. Most customers notice the chatter is gone after the first drive cycle.
Yes. TRI-EX 75W-90 Limited Slip meets or exceeds API GL-5, API MT-1, MIL-PRF-2105E/D, Mack GO-J/GO-H, Meritor O-81, and Eaton PS-386, making it compatible with most domestic trucks, SUVs, and performance vehicles.
The advanced formulation reduces operating temperatures and forms a protective boundary layer on metal surfaces, significantly extending gear and bearing life while lowering maintenance costs.
Absolutely. It performs exceptionally well in limited-slip differentials (thanks to the built-in friction modifier) and also excels in standard manual transmissions, transfer cases, and worm gears.
All TriboDyn TRI-EX gear oils are proudly manufactured in our own ISO 9001 certified facility in the United States by a team of experienced tribologists who have engineered lubricants for aerospace, racing, and heavy industry for decades.
