High-quality coolant oil intended for use in sealed indirect heating systems. It is made on the basis of highly refined base oils resistant to thermal cracking and oxidation.

It has good pumpability at startup and at operating temperatures. During operation, there is no significant decrease in the flash point of these oils, since they are resistant to thermal cracking at operating temperatures.

Mobiltherm 605 oil has a very high thermal stability and a very long service life without sediment formation and increased viscosity. It has a high specific heat capacity and thermal conductivity, which provides faster heating and improves the thermodynamic characteristics of the system. Mobiltherm 605 oil is recommended for use in closed sealed systems of indirect heating and cooling in all types of industrial processes.


Mobiltherm 605 coolant oil is recommended for use in both open and closed systems in the following ranges of volumetric oil temperature and the minimum temperature at shutdown is not lower than minus 7°C.

Closed systems: -7C - 315C

Open systems: -7C - 180C

Like any other mineral oils, Mobiltherm 605 coolant oil should be used only in systems with forced circulation. Systems with convection circulation do not provide a circulation rate sufficient to prevent local overheating and rapid deterioration of oil characteristics. In addition, this oil is not recommended for use in open systems in which hot oil can come into direct contact with air.

Oil can ignite spontaneously if it leaks from a damaged system!

Compatibility and miscibility

Mobiltherm 605 coolant oil should not be mixed with conventional oils, as this may impair its excellent thermal and oxidative stability, lead to changes in other characteristics and make it difficult to interpret the results of analyses performed to determine the service life of the oil. At temperatures exceeding the specified recommended maximum values, a steam plug may form if the system is not designed to operate at such a temperature by creating an inert gas pressure, such as nitrogen. At higher temperatures, the service life of oils is shortened, because at temperatures exceeding the recommended limit values, the rate of thermal decomposition increases markedly.

In optimally designed systems, the temperature of the oil film surrounding the heating element should be 15C - 30C higher than the volumetric oil temperature. If these values are exceeded, the service life of the oil may be shortened and the formation of sludge and deposits may occur, which will reduce the heat transfer rate.


High resistance to thermal cracking prevents the formation of sludge and carbon deposits and practically does not interfere with heat transfer;
Excellent thermal characteristics provide better heat transfer and increased efficiency during operation;
Good thermal and oxidative stability ensures a long service life of the oil and reduces the cost of equipment downtime;
The low solidification temperature ensures easy start-up of systems at low temperatures.