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Product Description

Synergy Gear Oils 80W-90-GL4 and 85W-140-GL5 are extra high performance commercial gear lubricants formulated from select base oils and an advanced additive system. These lubricants are engineered for performance in heavy-duty commercial transmissions, axles, and final drives where extreme pressures and shock loading are expected. They provide excellent chemical and thermal stability at elevated bulk oil temperatures, good performance at low temperatures, and have demonstrated good rust protection resulting from water contamination and wet conditions. They are recommended by ExxonMobil for applications where API GL-5 and MT-1 service is required. Synergy Gear Oils 80W-90-GL4 and 85W-140-GL5 share common formulations with Synergy Gear Oils GX 80W-90-GL4 and 85W-140-GL5.

Application Method


      Recommended by ExxonMobil for use in:

  • Heavy-duty manual transmissions, axles, and final drives requiring API GL-5 and MT-1 level performance
  • On-highway light and heavy-duty trucks, busses, vans, and cars
  • Off-highway industries including: construction, mining, quarrying, and agriculture
  • Other heavy-duty industrial and automotive applications involving hypoid and other gears operating under conditions where high speed/shock load, high speed/low torque, and/or low speed/high torque conditions prevail
  • Initial fill, top-off, and refill of enclosed commercial gearing in manual or semiautomatic transmissions where gear lubricants are recommended including drive axles and final drives
  • Not recommended for applications requiring API GL-4 Level performance
  • Not intended for transmissions for which engine oil or automatic transmission fluids are recommended


  • Extended gear and bearing life due to minimal deposits and longer seal life 
  • Increased load carrying capability and reduced operating costs
  • Reduced wear and longer component life
  • Reduced number of gear lubricants to simplify inventory and minimize misapplication
  • Maintains film strength for effective lubrication
  • Minimum leakage and reduced contamination


  • Excellent thermal stability and resistance to high temperature oxidation
  • Good protection against low speed/high torque wear and against high speed scoring
  • Excellent rust, staining, and corrosion protection
  • Effective low temperature lubrication
  • Wide multipurpose capability
  • Compatible with typical automotive seals and gaskets
  • Good resistance to foaming


Typical  Properties

Synergy Gear Oils


SAE Grade



Viscosity, ASTM D 445    
cSt @ 40ºC 139 333
cSt @ 100ºC 14.5 25.4
Viscosity Index, ASTM D 2270 103 99
Pour Point, ºC, ASTM D 97 -27 -18
Flash Point, ºC, ASTM D 92 210 230
Density @ 15ºC kg/l, ASTM D 4052 0.895 0.903



      Synergy Gear Oils

Safety Information 

RUST-X products do not contain Lead (Pb), Mercury (Hg), Cadmium (Cd), Hexavalent Chromium (Cr6), Polybrominated biphenyls (PBB), or Polybrominated di-phenylether complying with the re-stricted substances listed in Article 4(1) of the RoHS Directive

RUST-X products are also REACH Compliant for exports to the European Union.