Mobil Delvac 1™ Gear Oil 80W-140

Mobil Delvac 1™ Gear Oil 80W-140
Mobil Delvac 1 Gear Oil 80W-140 is a fully synthetic drivetrain lubricant engineered to meet very demanding extended drain and warranty requirements. This gear oil is designed for use in heavy-duty drivetrains that require gear lubricants with excellent load-carrying capability and where extreme pressures and shock loading are expected. 

Mobil Delvac 1 Gear Oil 80W-140 incorporates synthetic base stocks and advanced additives, providing significant advantages over conventional gear oils. The state-of-the-art technology in Mobil Delvac 1 Gear Oil 80W-140 delivers excellent performance, helps to protect against thermal degradation and oxidation, and contributes to reduced wear and corrosion, improved shear stability and extended service capability. 

This oil can be used for on-highway light- and heavy-duty trucks, buses and vans. Other applications include off-highway industries, such as construction, mining, quarrying and agriculture. 

Important: This oil is not recommended for applications requiring API GL-4 level performance. It is not intended for automatic, manual or semiautomatic transmissions for which engine oil or automatic transmission fluids are recommended. 

Please refer to the owner’s handbook for the OEM application requirements for your vehicle or equipment. 

Features and Benefits


Advantages and Potential Benefits

Exceptional thermal stability and resistance to high temperature oxidation

Extended gear and bearing life due to minimal deposits

Longer seal life

Outstanding protection against low speed/high torque wear and high speed scoring

Increased load-carrying capability

Reduced maintenance costs and longer equipment life

Exceptional shear stability

Retains viscosity and film strength under severe operating conditions to prevent wear

Excellent rust, staining, and corrosion protection of copper and its alloys

Reduced wear and longer component life

Enhanced friction reduction properties

Improved fuel economy and reduced operating costs

Outstanding low temperature fluidity versus mineral oils

Reduced wear and ease of start-up

Good resistance to foaming

Maintains film strength for reliable lubrication

Compatible with typical automotive seals and gaskets

Minimum leakage and reduced contamination



Recommended by ExxonMobil for use in:

  • Heavy-duty manual transmissions, axles and final drives requiring API GL-5 and MT-1 performance

  • On-highway light and heavy-duty trucks, busses and vans

  • Off-highway industries including: construction, mining, quarrying, and agriculture

  • Other heavy-duty industrial gear drives including hypoid and worm gears operating under conditions where high speed/shock load, high speed/low torque, and/or low speed/high torque conditions prevail

  • Differentials, final drives, transfer cases and other gear applications where lubricants meeting MIL-PRF-2105E, API Service GL-5 , EP gear lubricants are recommended

  • Equipment such as winch reduction gears and crawler vehicle propulsion gear drives that are exposed to severe low temperatures

  • Applications where extended service intervals and warranties are required

  • Not recommended for applications requiring API GL-4 Level performance

  • Not intended for automatic, manual or semiautomatic transmissions for which engine oil or automatic transmission fluids are recommended


Specifications and Approvals

This product has the following approvals:

Dana SHAES 429

Mack GO-J

Navistar, Inc.MPAPS B-6821

SAE J2360





Meritor O-95 


This product is recommended for use in applications requiring:

Dana SHAES 256 Rev A



This product meets or exceeds the requirements of:




Properties and Specifications




SAE 80W-140

Kinematic Viscosity @ 100 C, mm2/s, ASTM D445


Kinematic Viscosity @ 40 C, mm2/s, ASTM D445


Viscosity Index, ASTM D2270


Pour Point, °C, ASTM D97


Flash Point, Cleveland Open Cup, °C, ASTM D92


Density @ 15.6 C, kg/l, ASTM D4052



Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @

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