Mobiltherm 43

Premium Heat Transfer Oil

Mobiltherm 43 is a formulated paraffinic type fluid designed for closed heat transfer systems operating at higher bulk temperatures including demanding open systems.  It has a high specific heat and thermal conductivity to provide more rapid heating and greater flexibility in a system.


Equipment lubricant recommendations

Our Mobil Serv℠ Product Selector tool will help you identify lubricant(s) for your specific equipment.

Data sheets

Features and Benefits

When used as recommended, Mobiltherm 43 will provide the following benefits and advantages:

•  Resistant to thermal cracking - performs well up to 315.5C(600F)

•  Excellent Oxidation Stability - Minimizes sludge and acid formation, extends product life

•  Low Temperature Performance - Permits easy cold weather starting in temperatures down to -6.7C(20F)

•  High Heating Efficiency - High specific heat and thermal conductivity help keep fuel costs down

•  Low Volatility - Reduces potential for pump cavitation



Mobiltherm 43 is recommended for the following applications:

     •  Asphalt and cold tar storage, transport and compounding

     •  Dyes, chemicals and pharmaceuticals manufacture

     •  Lumber drying

     •  Paper and paperboard production

     •  Petroleum products processing

     •  Plywood laminating

     •  Rubber and plastics molding, extrusion, curing, and calendering

     •  Sheet metal laminating

     •  Solar energy heat transfer and storage

     •  Textiles (hot calendering)

     •  Tiles, linoleum, and roofing products

     •  Varnish and resins manufacture


Properties and Specifications


ASTM Color, ASTM D1500


Autoignition Temperature, °C, ASTM E659


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


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


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


Pour Point, °C, ASTM D97


Density @ 15 C, kg/l, ASTM D1298



Health and safety

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