Mobil Rarus 400 Series is a high performance air compressor lubricant for reciprocating air compressors operating under severe conditions, but not for air compressor applications compressing breathing air. Mobil Rarus 400 series provides outstanding anti-wear protection with excellent resistance to oxidation and thermal degradation. Compared to mineral oils, this product significantly reduces the likelihood of fire and explosion, reduces scale formation, and has a high auto-ignition point for improved performance and safety.