United Synthetic R&O Compressor Oils are full-synthetic, non-detergent oils formulated to deliver excellent anti-wear performance in single- and multi-stage rotary screw, vane and reciprocating compressors and certain vacuum pumps. These oils are formulated to provide up to an 8,000-hour drain interval in rotary screw compressors (at a 200 Degree F discharge temperature). These oils are not recommended for "breathing air" or refrigeration compressors.