Mobil Rarus 427 (5 Gal. Pail)
Designed for the stringent requirements of major compressor manufacturers, Mobil Rarus 427 is a superior ISO VG 100 ashless lubricant for use in single and multistage air compressors. Mobil Rarus 427 is intended for lubricating compressor systems employing gears and bearings, making them a great pick for crankcases and cylinders. The low ash and carbon formation of these products results in improved valve performance and reduced deposits in discharge lines, which means improved compressor performance overall, in addition to reduced safety concerns. Mobil Rarus 427 has a high load-carrying ability, which reduces wear on cylinders, rings, gears and bearings. This product also has exceptional water separability, which inhibits sludge formation, blockage and carryover to downstream equipment. Mobil Rarus 427 is especially effective for continuous high-temperature operation.
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 life Improved filter life Lower maintenance costs |
| High Load-carrying ability | Reduced wear of rings, cylinders, bearings and gears |
| Excellent Water Separability | Less 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 Protection | Improved protection of valves and reduced wear of rings and cylinders |
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
| 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 |
| 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 |
