TriboDyn Tri-Guard ISO 46 PAO Rotary Screws Synthetic Compressor Oil. Is designed for reciprocating air compressors that require an ISO 46 non-detergent compressor oil. TriboDyn Tri-Guard ISO 46 Synthetic Compressor Oil.Is compatible with most synthetic and/or conventional compressor oils and may be used as a Break-In oil. For breathing air or refrigeration compressors. Silicones or polyglycol (PAG) fluids.