Mobilube HD Extra

Mobil Commercial Vehicle Lube, Canada

High Performance Commercial Gear Lubricants

Product Description

Mobilube™ HD Extra MG 75W and 80W-140 are 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 manual transmissions, axles, and final drives where severe service with shock loading is expected. They provide excellent chemical and thermal stability at elevated bulk oil temperatures, good performance at low temperatures, and good rust protection resulting from water contamination and wet conditions. They will provide excellent performance in applications where API GL-6 (Mobilube HD Extra 80W-140) or GL-6/GL-5 (Mobilube Extra MG 75W) lubricants are required. API GL-6 denotes lubricants intended for gears with very high pinion offset where protection from gear scoring in excess of that provided by GL-5 lubricants is required. API GL-6 is no longer active as the original test equipment and procedures are obsolete.


Features and Benefits

Today's heavy equipment applications place higher performance demands on drive train lubricants. Higher speeds, higher torque, and heavier loads require improved formulations to maximize equipment life and optimize operating costs. Longer service intervals place additional demands on the gear lubricant. Mobilube HD Extra gear lubricants are engineered to meet these challenges. The key benefits include:


FeaturesAdvantages and Potential Benefits
Excellent thermal stability and resistance to high temperature oxidationExtended gear and bearing life due to minimal deposits and longer seal life
Good protection against low speed/high torque wear and against high speed scoringIncreased load carrying capability and reduced operating costs
Excellent rust, staining, and corrosion protectionReduced wear and longer component life
Effective low temperature lubricationReduced wear and ease of start-up
Wide multipurpose capabilityReduced number of gear lubricants to simplify inventory and minimize misapplication
Good resistance to foamingMaintains film strength for effective lubrication
Compatible with typical automotive seals and gasketsMinimum leakage and reduced contamination



  • Heavy-duty manual transmissions, axles, and final drives requiring API GL-6 (inactive) or GL-5 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
  • Mobilube HD Extra gear lubricants are intended for 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


Specifications and Approvals

Mobilube HD Extra is recommended by Imperial Oil for use in applications requiring:MG 75W80W-140


Typical Properties

Mobilube HD Extra  
SAE GradeMG 75W80W-140
Viscosity, ASTM D 445        
     cSt @ 40ºC  93268
     cSt @ 100ºC  15.927.4
Viscosity Index, ASTM D 2270  182134
Pour Point, ºC, ASTM D 97-48-33
Flash Point, ºC, ASTM D 92150160
Density @ 15ºC kg/l, ASTM D 4052  0.9030.894


Health and Safety

The products described on this data sheet are manufactured from high quality petroleum base stocks, carefully blended with selected additives. As with all petroleum products, good personal hygiene and careful handling should always be practiced. Avoid prolonged contact to skin, splashing into the eyes, ingestion or vapour inhalation. Please refer to the Material Safety Data Sheet for further information.

Note: The products described on this data sheet are NOT controlled under Canadian WHMIS legislation.

All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.


Imperial Oil

Petroleum and Chemicals Division
Lubricants and Specialties
240 Fourth Ave SW
C. P. 2480, Station M
Calgary AB T2P 3 M 9


Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification. Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations. The information contained herein is subject to change without notice. All products may not be available locally. For more information, contact your local ExxonMobil contact or visit
ExxonMobil is comprised of numerous affiliates and subsidiaries, many with names that include Esso, Mobil, or ExxonMobil. Nothing in this document is intended to override or supersede the corporate separateness of local entities. Responsibility for local action and accountability remains with the local ExxonMobil-affiliate entities.