Mobil Rarus™ 400 Series air compressor oils
Our Mobil Rarus™ 400 Series ashless air compressor oils are recommended for single and multistage air compressors operating under mild to severe conditions. They are formulated with high-quality mineral base oils and a high-performance additive system to provide exceptional equipment protection and reliability for compressors.
Mobil Rarus 400 Series air compressor oils offer a range of benefits* including:
- Cleaner compressors and lower deposits
- Longer running periods between maintenance intervals
- Improved valve performance while controlling sludge and deposit formation
- Enhanced equipment life and lower maintenance costs
*when compared to conventional mineral oils
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Data Sheet
Product data sheet (PDS) 
Safety data sheet (SDS) Product Information
1.753 MB/pdf
Technical resources
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Features and Benefits
The use of the Mobil Rarus 400 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 |
| Low Ash and Carbon Formation |
Improved valve performance Reduced deposits in discharge lines Reduced potential for fires and explosions in discharge systems Improved compressor performance |
| Outstanding Oxidation and Thermal Stability | Longer oil lifeImproved filter lifeLower maintenance costs |
| High Load-carrying ability |
Reduced wear of rings, cylinders, bearings and gears |
| Excellent Water Separability |
Less carryover to downstream equipmentReduced sludge formation in crankcases and discharge linesReduced blockage of coalescersLess potential for emulsion formation |
| Effective Rust and Corrosion Protection |
Improved protection of valves and reduced wear of rings and cylinders |
Specifications and Approvals
|
Mobil Rarus 400 Series meets or exceeds the requirements of: |
424 |
425 |
426 |
427 |
429 |
| DIN 51506 VD-L (1985-09) | X | X | X | X | X |
Applications
The Mobil Rarus 400 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 400 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 400 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 400 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
Typical Properties
|
Mobil Rarus 400 Series |
424 |
425 |
426 |
427 |
429 |
| ISO Viscosity Grade | 32 | 46 | 68 | 100 | 150 |
| Viscosity, ASTM D 445 |
|
|
|
|
|
| cSt @ 40º C | 32 | 46 | 68 | 104.6 | 147.3 |
| cSt @ 100º C | 5.4 | 6.9 | 8.9 | 11.6 | 14.7 |
| Viscosity Index, ASTM D 2270 | 105 | 105 | 105 | 100 | 100 |
| Sulfated Ash, wt%, ASTM D 874 | ‹0.01 | ‹0.01 | ‹0.01 | ‹0.01 | ‹0.01 |
| Copper Strip Corrosion, ASTM D130, 3 h @ 100º C | 1B | 1B | 1A | 1B | 1A |
| FZG Load Support, DIN 51354, Fail Stage | 12 | 11 | 12 | 11 | 11 |
| Rust Characteristics; ASTM D665 B; ASTM D665 A | Pass | Pass | Pass | Pass | Pass |
| Foam Seq I, ASTM D 892 | 10/0 | 20/0 | 0/0 | 30/0 | 430/20 |
| Flash Point, ºC, ASTM D 92 | 236 | 238 | 251 | 264 | 269 |
| Density @ 15º C, ASTM D 1298 | 0.866 | 0.873 | 0.877 | 0.879 | 0.866 |
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