The Mobil DTE family of products is well known and highly regarded world-wide based on their outstanding performance and the RandD expertise and the global technical support which stand behind the brand. The highly versatile performance of one series of oils in this family, Mobil DTE Oil Double Letter Series oils, has made them the choice of many users around the world for many decades.

Mobil DTE Named oils enjoy an excellent reputation in the lubrication of the circulation systems of industrial gearboxes, plus a wide variety of ancillary equipment, including hydraulic systems. As designs change and increase in severity, it is the challenge of our scientists to understand the effect of these changes on the lubricant and to formulate these products for the broad versatility they are recognized for.

For the Mobil DTE Oil Double Letter Series of lubricants this process has resulted in the use of a proprietary high quality base stocks for outstanding oxidation stability, plus a unique additive combination to ensure the excellent, wide-ranging performance of these oils. A review of the features, advantages and potential benefits of the product are shown below:


Advantages and Potential Benefits

Excellent thermal/oxidative and chemical degradation resistance

Long lubricant charge life giving extended drain periods and reduced product replacement costs; reduced filter deposits and longer filter life

Outstanding anti-wear performance

Reduced pump wear leading to longer pump life, protection of critical bearings and gearing

Protection against rust and corrosion in both the liquid and vapour phase

Enhanced system cleanliness for reduced maintenance and un-planned stoppages

Good demulsibility and avoids emulsion formation

Improved operating efficiency and lower operating costs

Multiple application capability

Reduced plant inventory savings


These oils are intended primarily for the lubrication of plain bearings, roller bearings, parallel shaft and bevel gearing. They are suitable as multipurpose lubricants in systems not subject to shock loading and which do not require extreme pressure performance. They are used in applications using splash, bath and ring oil arrangements and all other application methods involving pumps, valves and auxiliary equipment. They are recommended for use in hydraulic systems where higher viscosity oils are specified.

  • Moderate duty spur, bevel, helical and herringbone gear units
  • Circulating systems
  • Mobil DTE Oil Extra Heavy and BB can also be used in hydraulic systems employing gear, vane, radial and axial piston pumps where anti-wear hydraulic fluids are required and clearances are relatively large
  • Certain compressors and vacuum pumps handling air, natural gas and inert gases provided the discharge temperatures do not exceed 150°C

Typical Properties

MOBIL DTE Oil Double Letter Series

Mobil DTE Oil Extra Heavy

Mobil DTE Oil BB

ISO Viscosity Grade



Viscosity, ASTM D 445

cSt @ 40ºC



cSt @ 100ºC



Viscosity Index, ASTM D 2270



Pour Point, ºC, ASTM D 97



Flash Point, ºC, ASTM D 92



Density @15ºC, ASTM D 1298, kg/l



Demulsibility for non-EP oils, ASTM D2711, ml free water



Water separability, ASTM D 1401, Min. to 40/37/3 ml emulsion @ 82ºC



Rust Prevention, ASTM D 665

Distilled Water



Sea Water



Copper Corrosion, ASTM D 130 hours @ 100ºC



FZG Gear Test, DIN 51354, Failure Stage




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i have a Davis standard extruder that has a circulating pump for our gear box and that is what is required
john j on Apr 25, 2019
i have a Davis standard extruder that has a circulating pump for our gear box and that is what is required
john j on Apr 25, 2019
what is the operating temperature range for this oil?
Maggs on Jan 2, 2019
BEST ANSWER: This varies in the application that it's going into and what it will tolerate. It is no longer a liquid state a -5 degrees F and will oxidize between 160-170 degree F. Depending on how far you stay away from those temperatures will be a key factor. This product may be too thin or too thick (depending on temperature) for your application, if you need more information please contact customer service at 847-608-7124.