MOBIL RARUS 829 is an Air Compressor Lubricants
The Mobil Rarus™ 829 is a line of supreme performance air compressor lubricants primarily intended for
the lubrication of severe duty reciprocating air compressors but not recommended for air compressors used in
breathing air applications. They are engineered to meet or exceed the stringent requirements of the major
compressor manufacturers. They are formulated with design-specific synthetic base-oils and a high technology
additive system that assures exceptional equipment protection and reliability for compressors operating under
conditions where mineral-oil based products are not meeting expectations. Mobil Rarus 829 provides
excellent wear protection and outstanding resistance to oxidation and thermal degradation, greatly superior to
mineral oils. Their unique formulation provides the ability to help reduce maintenance costs through minimising
equipment problems and downstream deposits and carryover.
Mobil Rarus 829 Series lubricants significantly reduce the potential for fires and explosions, compared to
mineral oil-based products. They exhibit a virtual absence of deposit formation and higher autogenous ignition
temperatures improving both performance and safety. Their exceptional water separating characteristics reduce
problems with emulsion formation and carryover into downstream piping and equipment. They are
recommended or approved by many of the leading compressor manufacturers.
The Mobil Rarus 829 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 829 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 829 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 829, but lacquer, varnish, pvc and acrylic paints are
The following types of compressor applications have shown excellent performance with the Mobil Rarus 829 oils:
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