Mobil Rarus 827 (Pail)

SKU# XOM104820

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Quick Overview

Mobil Rarus 827 is a supreme performance synthetic air compressor lubricant engineered for the lubrication of severe duty reciprocating air compressors*. It provides wear protection and resistance to oxidation and thermal degradation that is far superior to mineral oils. This high performance lubricant also greatly reduces the potential for fires and explosions compared to mineral oil based products. In addition, it displays excellent water seperability, protecting downstream equipment and reducing sludge formation.

Mobil Rarus 827 meets or exceeds the strict requirements of major compressor manufacturers.

*Not recommended for air compressors used in breathing air applications.

Product Data Sheet

Mobil Rarus 827 Pail

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  • Mobil Rarus 827 Pail

The use of the Mobil Rarus 800 Series oils can result in cleaner compressors and lower deposits compared to conventional mineral oils, resulting in longer running periods between maintenance intervals. Their excellent oxidation and thermal stability safely allow extended life capability while controlling sludge and deposit formation. They possess outstanding anti-wear and corrosion protection, which enhances equipment life and performance.

FeaturesAdvantages and Potential Benefits
High Performance Synthetic Base StocksSignificant performance capabilities relative to mineral oils
Improved safety
Low Ash and Carbon FormationImproved valve performance
Reduced deposits in discharge lines
Reduced potential for fires and explosions in discharge systems
Improved compressor performance
Outstanding Oxidation and Thermal StabilityLonger oil life
Improved filter life
Lower maintenance costs
High Load-carrying abilityReduced wear of rings, cylinders, bearings and gears
Excellent Water SeparabilityLess carryover to downstream equipment
Reduced sludge formation in crankcases and discharge lines
Reduced blockage of coalescers
Less potential for emulsion formation
Effective Rust and Corrosion ProtectionImproved protection of valves and reduced wear of rings and cylinders

The Mobil Rarus 800 Series oils are recommended for single and multistage air compressors, but are not recommended for air compressors used in breathing air applications. They are particularly effective for continuous high temperature operation with discharge temperatures up to 200ºC. They are suitable for reciprocating and rotary type machines with the lower viscosity grades mainly used in rotary compressors. Rarus 800 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-based lubricants but admixture will detract from their performance capabilities. Mobil Rarus 800 Series oils are compatible with seals made from fluorinated hydrocarbon, silicone, fluorosilicone, polysulfide, Viton, Teflon, and high nitrile Buna N NBR (above 36% acrylonitrile) materials. Materials not recommended include low nitrile Bune N NBR (below 30% acrylonitrile), natural and butyl rubbers, Neoprene, polyacrylate, styrene/butadiene and chlorosulfonated polyethylene.

Oil resistant paints are not affected by Mobil Rarus 800 Series, but lacquer, varnish, pvc and acrylic paints are not recommended.

The following types of compressor applications have shown excellent performance with the Mobil Rarus 800 Series oils:

  • All types of air compressors but specifically recommended for reciprocating air compressor
  • Units operating under severe conditions
  • Multistage units with a history of excessive oil degradation from mineral oil-based products
  • They can be used for cylinder and crankcase lubrication
  • Compressor systems with critical gears and bearings
  • Compressors used in stationary and mobile applications
Typical Properties

Mobil Rarus 800 Series824827829
ISO Viscosity Grade32100150
Viscosity, ASTM D 445   
cSt @ 40º C29.5107.5158
cSt @ 100º C5.510.1213.2
Viscosity Index, ASTM D 22701276670
Total Acid Number, ASTM D 974, mgKOH/g0.060.150.14
Copper Strip Corrosion, ASTM D130, 3 h @ 121º C1B1B1B
Rust Characteristics Proc A, ASTM D 665PassPassPass
Foam Seq I, ASTM D 89210/010/050/0
Pour Point, ASTM D 97, ºC-54-36-40
Flash Point, ºC, ASTM D 92244270270