Mobil Avrex S Turbo 256 gas turbine lubricant is a combination of a highlystable synthetic base fluid and a unique chemical additive package. Thecombination provides outstanding thermal and oxidative stability to resistdeterioration and deposit formation in both the liquid and vapor phases, aswell as excellent resistance to foaming. The effective operating range of Mobil Avrex S Turbo 256 is between -54°C and176°C (-65°F and 350°F). The pour point is below -60°C (-75°F). The producthas a high specific heat in order to ensure good heat transfer from oil-cooledengine parts. In extensive laboratory testing and in-flight performance,Mobil Avrex S Turbo 256 exhibits excellent bulk oil stability at temperaturesup to 176°C (350°F). The evaporation rate at these temperatures is low enoughto prevent excessive loss of volume.