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Why choose TriboDyn Gear Oils
Premium Full Synthetic Oils
Engineered with high-quality full-synthetic base stocks and advanced additive packages that deliver superior protection, smoother operation, and longer service life compared to conventional or synthetic-blend gear oils.
The Highest Film Strength Available
Independent university testing proves our Tri-Ex² gear oils deliver the highest film strength of any major brand tested — providing unmatched protection against metal-to-metal contact under extreme pressure and load.
Exceptional Thermal Stability
Our advanced synthetic formulation resists breakdown at high temperatures, maintains viscosity, and prevents oxidation and varnish — keeping gears protected even in the most demanding towing, hauling, and heavy-duty applications.
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Meets or Exceeds OEM Specifications
API GL-5, MT-1, Eaton PS-386, Mack GO-J / GO-H, Meritor O-81, ZF Freedomline, MIL-PRF-2105E and more – formulated for heavy-duty transmissions, differentials, and limited-slip applications
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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Frequently Asked Questions
Yes — our Tri-Ex² gear oils meet or exceed API GL-5, MT-1, Eaton PS-386, Mack GO-J / GO-H, Meritor O-81, ZF Freedomline, MIL-PRF-2105E, and many other OEM requirements.
75W-90 is ideal for most passenger cars and light trucks. 75W-140 is best for towing, hauling, and high-torque applications. 50W is engineered for heavy-duty manual transmissions and severe-service fleet use. Our Limited Slip formulas (75W-90 & 75W-140) are specifically made for positraction and limited-slip differentials.
Tri-Ex² uses premium full-synthetic base stocks and advanced EP additives that deliver the highest film strength available, and patented ceramic coating for superior thermal stability, smoother quieter operation, and longer service life compared to conventional or synthetic-blend gear oils.
No. Our Limited Slip Gear Oils already contain the proper built-in friction modifier, so you can install them directly without adding any extra additives.
We recommend using the same TriboDyn Tri-Ex² gear oil throughout the system for best performance. All our gear oils are compatible with each other, but mixing viscosities or brands may reduce the overall protection and performance.
Follow your vehicle or equipment manufacturer’s recommended service interval. In severe-service conditions (towing, heavy hauling, or commercial use), more frequent changes may be beneficial due to the extreme loads and heat our oils are designed to handle.
