Lubriplate® AC-3 and AC-4 air compressor oils are dual-purpose or multi-functional lubricants for use in air compressors, hydraulic systems and oil recirculating systems. Lubriplate® AC-3 and AC-4 air compressor oils for air compressors offer excellent lubrication at elevated temperatures and high pressures, providing sustained operation and lower maintenance cost by reducing carbon and varnish build-up. Lubriplate® Air Compressor Oil, Anti-Wear Petroleum Based, Series: AC-4, 55 gal Container, Drum Container, 950 SUS at 100 °F Viscosity, Liquid Form, Composition: Distillates, Hydrotreated Heavy/Light Paraffinic, Residual Oils, Solvent-Dewaxed, Amber, Mineral Oil Odor/Scent, ISO 220/SAE 40 Grade, 495 °F Flash Point, Flammability: 1, 0.86 to 0.87 Specific Gravity