Grodal Therm 500 Description It is preferred for use in heat transfer systems operating up to temperatures of 320°C. The Growel Advantage : It reduces oil change periods because of its special formulation. Its use reduces the frequency of make-up on account of its lower evaporation losses. It develops the least amount of oxidation products during use. Ensures lower power consumption due to its low viscosity and good pumpability. get a quote