Mobil Rarus™ 400 Series is a line of premium performance ‘ashless’ air compressor lubricants designed to meet the rigorous requirements of major compressor manufacturers. They are formulated with high quality bases and a high performance additive capable of providing both exceptional machine protection and ensuring reliability for compressors operating in medium to severe operating conditions. They provide excellent wear protection and the ability to reduce maintenance costs through reduced machine problems and reduced oil carryover. The high FZG value makes Mobil Rarus 400 series exceptional lubricants for compressor systems using gears and bearings, and makes them an excellent choice as a lubricant for both crankcases and cylinders.