Radcolube® 800, is a high viscosity synthetic, high stability tri-ester based fluid.  It is designed for use in reciprocating compressors under adverse conditions of high temperature and pressure.  This fluid demonstrates excellent thermal and oxidative stability.  It will not varnish or form carbon deposits, and has low volatility and low toxicity. The nominal operating range is -15°C to 230°C (5° F to 445° F)