Mobil Rarus™ 800 Series: Product Description

Mobil Rarus™ 800 Series Page 1 of 3
Mobil Rarus™ 800 Series

Mobil Industrial , United States
Air Compressor Lubricants
Product Description
The Mobil Rarus™ 800 Series 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 800 Series 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 800 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.
Features and Benefits
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.
Features Advantages and Potential Benefits
Significant performance capabilities relative to mineral oils

High Performance Synthetic Base Stocks
Improved safety
Improved valve performance

Reduced deposits in discharge lines
Low Ash and Carbon Formation
Reduced potential for fires and explosions in discharge systems
Improved compressor performance
Longer oil life

Outstanding Oxidation and Thermal Stability Improved filter life
Lower maintenance costs
High Load-carrying ability Reduced wear of rings, cylinders, bearings and gears
Less carryover to downstream equipment

Reduced sludge formation in crankcases and discharge lines
Excellent Water Separability
Reduced blockage of coalescers
Less potential for emulsion formation
Effective Rust and Corrosion Protection Improved protection of valves and reduced wear of rings and cylinders
Applications
05.08.2021
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
Properties and Specifications
Property 824 827 829
Grade ISO 32 ISO 100 ISO 150
Copper Strip Corrosion, 3 h, 121 C, Rating, ASTM D130 1B 1B 1B
Flash Point, Cleveland Open Cup, °C, ASTM D92 244 270 270
Foam, Sequence I, Stability, ml, ASTM D892 0 0 0
Foam, Sequence I, Tendency, ml, ASTM D892 10 10 10
Kinematic Viscosity @ 100 C, mm2/s, ASTM D445 5.5 10.12 13.2
Kinematic Viscosity @ 40 C, mm2/s, ASTM D445 29.5 107.5 158
Pour Point, °C, ASTM D5950 -54 -36 -40
Rust Characteristics, Procedure A, ASTM D665 PASS PASS PASS
Total Acid Number, mgKOH/g, ASTM D974(mod) 0.06 0.15 0.14
Viscosity Index, ASTM D2270 127 66 70
Health and Safety
Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com/psims
/psims.aspx
All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.
05-2020
05.08.2021
Exxon Mobil Corporation
22777 Springwoods Village Parkway
Spring TX 77389
1-800-ASK MOBIL (275-6624)
Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification. Variations that do not affect product
performance are to be expected during normal manufacture and at different blending locations. The information contained herein is subject to change without
notice. All products may not be available locally. For more information, contact your local ExxonMobil contact or visit www.exxonmobil.com
ExxonMobil is comprised of numerous affiliates and subsidiaries, many with names that include Esso, Mobil, or ExxonMobil. Nothing in this document is
intended to override or supersede the corporate separateness of local entities. Responsibility for local action and accountability remains with the local
ExxonMobil-affiliate entities.
Energy lives here™
© Copyright 2003-2019 Exxon Mobil Corporation. All

Rights Reserved
05.08.2021

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Mobil Rarus™ 800 Series Page 1 of 3

Mobil Rarus™ 800 Series

Features and Benefits

Features Advantages and Potential Benefits

Significant performance capabilities relative to mineral oils

Improved valve performance

Longer oil life

Less carryover to downstream equipment

Properties and Specifications

Property 824 827 829

Grade ISO 32 ISO 100 ISO 150

Copper Strip Corrosion, 3 h, 121 C, Rating, ASTM D130 1B 1B 1B

Foam, Sequence I, Stability, ml, ASTM D892 0 0 0

Foam, Sequence I, Tendency, ml, ASTM D892 10 10 10

Kinematic Viscosity @ 100 C, mm2/s, ASTM D445 5.5 10.12 13.2

Kinematic Viscosity @ 40 C, mm2/s, ASTM D445 29.5 107.5 158

Pour Point, °C, ASTM D5950 -54 -36 -40

Rust Characteristics, Procedure A, ASTM D665 PASS PASS PASS

Total Acid Number, mgKOH/g, ASTM D974(mod) 0.06 0.15 0.14

Viscosity Index, ASTM D2270 127 66 70

Health and Safety

Energy lives here™

© Copyright 2003-2019 Exxon Mobil Corporation. All

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