Mobil Rarus 425 is an Air Compressor Lubricants


Product Description

The Mobil Rarus™ 425  Series is a line of premium performance ashless air compressor lubricants designed to
meet the stringent requirements of the major compressor manufacturers. They are formulated with high quality
mineral base-oils and a high performance additive system designed to provide exceptional equipment protection
and reliability for compressors operating under mild to severe conditions. They provide excellent wear
protection and the ability to reduce maintenance costs through minimising equipment problems and downstream
deposits and carryover. Because of their high FZG Ratings, the Mobil Rarus 425 Series make outstanding
lubricants for compressor systems employing gears and bearings making them an excellent selection for
crankcases as well as cylinder lubricants.


The Mobil Rarus 425  Series oils are recommended for single and multistage air compressors. They are particularly effective for continuous high temperature operation. The maximum compressed air temperature, according to DIN 51506, is 220 °C. They are suitable for reciprocating and rotary type machines with the lower viscosity grades mainly used in rotary compressors. Rarus 425  Series oils are recommended for units with a history of excess oil degradation, poor valve performance or deposit formation. They are compatible with all metals used in compressor construction and with mineral-oil compatible elastomers used in seals, O-rings and gaskets.

Mobil Rarus 425 Series oils are not intended or recommended for use in air compressors for breathing applications.

The following types of compressors have shown excellent performance with the Mobil Rarus 425  Series oils:

  • Reciprocating air compressor crankcases and cylinders
  • Rotary screw compressors
  • Rotary vane compressors
  • Axial and centrifugal compressors
  • Compressor systems with critical gears and bearings
  • Compressors used in stationary and mobile applications


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