Mobil Rarus 425 Replacement Oil 

Phi Syn 46 is a semi synthetic ISO 46 air compressor oil designed as a replacement for Mobil Rarus 425. It is formulated to deliver dependable lubrication performance, consistent wear protection, and reliable fluid life in industrial compressor systems. This 5-gallon container is ideal for facilities performing scheduled maintenance on rotary screw and reciprocating air compressors requiring ISO 46 viscosity.

Engineered with high-quality hydrocarbon base oils and performance additives, Phi Syn 46 provides up to 4,000 hours of service life at temperatures up to 200°F. Its balanced ISO 46 viscosity supports stable film strength, effective heat transfer, and smooth compressor operation across a wide range of industrial conditions.

Designed for real-world operating environments, this semi synthetic compressor lubricant performs well in dusty, dirty, or high-contaminant applications where routine oil change intervals are part of preventative maintenance strategy. The 5-gallon pail format supports cost-effective bulk purchasing and simplified service planning.

Key Benefits

• Up to 4,000-hour service life at operating temperatures up to 200°F
• ISO 46 viscosity for balanced lubrication and thermal stability
• Semi synthetic hydrocarbon formulation for dependable compressor protection
• Strong anti-wear performance for critical rotating components
• Excellent water separation and foam resistance
• Designed for rotary screw and reciprocating air compressors
• 5-gallon container ideal for routine service intervals
• Helps reduce downtime and overall maintenance costs

Applications

Recommended for industrial facilities operating rotary screw and reciprocating compressors requiring ISO 46 semi synthetic air compressor oil, particularly in manufacturing plants, maintenance departments, automotive shops, and portable compressor fleets.

OEM Cross-Reference (For Identification & Compatibility Reference Only)

Suitable for compressor systems operating with ISO 46 semi-synthetic lubricants similar to:

• Mobil Rarus 425

AirCompressors.com is an independent distributor and supplier and is not affiliated with, authorized by, or endorsed by any original equipment manufacturer referenced above. OEM names and trademarks are used strictly for identification and compatibility purposes.

Why Choose AirCompressor.com House Brand Lubricants?

• Industrial-grade compressor oil engineered for consistent performance
• Transparent ISO viscosity alignment and technical specifications
• Cost-effective alternative to OEM semi-synthetic compressor oils
• Reliable availability for planned maintenance programs

Phi Syn 46 in the 5-gallon format delivers dependable semi synthetic compressor lubrication designed for industrial uptime and predictable maintenance scheduling.

Choosing the correct compressor oil is important for performance and equipment longevity. If you need help confirming compatibility, you can search our
oil cross reference tool,
browse the
compressor lubricant guide,
or use the
equivalent chart
to find suitable alternatives for your system.