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FUCHS RENISO S 68 is a synthetic refrigeration compressor lubricant formulated from high-grade alkylbenzenes (AB). With an ISO VG 68 viscosity grade, it is specifically engineered for refrigeration systems operating with HCFC refrigerants (such as R22), ammonia (NH3 / R717), and hydrocarbon refrigerants. The fluid exhibits superior thermal and chemical stability, preventing deposit formation and varnish buildup under demanding operational conditions. Its high natural solubility with fluorocarbon-based refrigerants ensures efficient oil return from the evaporator to the compressor. Additionally, FUCHS RENISO S 68 features excellent low-temperature flow properties, reliable wear protection for critical compressor parts, and full compliance with DIN 51503 standards for categories KAA, KC, and KE.