PSO process oil R is blended with high quality base stocks, possessing natural resistance to oxidation and thermal breakdown. This is a premier grade straight mineral oil containing no additives. By virtue of its high viscosity and viscosity index and other properties, it is suitable for use in many industrial applications where a thick lubricant once-through application is required. This grade is also suitable for systems where the oil stays relatively for shorter periods.


  • This oil is a general-purpose non-additive treated oil of reasonably good oxidation stability used for a variety of process applications. It is also suitable for once-through lubrication of industrial machinery.


  • Excellent choice in application requiring high viscosity straight mineral oils.
  • Good lubricating properties.
  • Good demulsification characteristics.

Performance Standards

ISO-VG  460

Typical Key Properties

PSO Process Oil R ISO VG 460 (Typical Results)
Kinematic Viscosity @ 40°C cSt,  (ASTM D-445) 460
Viscosity Index (ASTM D-2270) 95
Flash Point, (C0C), °C ASTM D-92 280
Pour Point, °C ASTM D97 -3

These typical characters tics are of existing production. Concurrently future production will conform to PSO specification variations in these characteristics may occur.