Mobil Rarus 400 Series Our Mobil Rarus™ 400 Series ashless air compressor oils are designed for compressor systems employing gears and bearings, and are highly recommended for crankcases. Mobil Rarus PE KPL 201 Mobil Rarus™ PE KPL 201 is a medium viscosity, colourless oil, of viscosity slightly above ISO VG 100. Mobil Rarus PE Series Mobil Rarus™ PE R-A, R-B, R-C and R-D 220 are viscous, colourless oils of ISO viscosity grade 220, specifically designed for the lubrication of very high pressure ethylene compressors. Mobil DTE Oil 205 Mobil DTE Oil 205 is a lubricating oil formulated to provide excellent anti-wear and friction-reducing properties for compressor cylinder lubrication as well as protection against rust and corrosion. Mobil Compressor Oil 150 IR MobilCompressor Oil 150 IR is a premium quality compounded lubricant specially developed for cylinder lubrication of gas compressors.