Medway Lubricants - Specialist Oils, Lubricants and Fluids


AGIP OSO is the trademark of a line of high quality hydraulic oils specially developed for use in all types of hydraulic systems and equipments. The oils are formulated from selected paraffinic base stocks treated with “low zinc” technology for a very high thermal, oxidative and hydrolytic stability. The oils are available in a wide range of viscosities to suit all practical requirements. (OSO 15 and 22 Classification ISO-L-FD; OSO 22-150 Classification ISO-L-HM).


OSO 15 22 32 37* 46
Viscosity at 40°C  mm²/s 14.3 21.5 30 37 45
Viscosity at 100°C  mm²/s  3.3  4.2  5.3  6.1  6.8
Viscosity Index  -  98  98  100  100  100
Flash Point COC  °C  190  195  205  210  212
Pour Point  °C -30 -30  -30  -27  -27
Mass density at 15°C  kg/l  0.860  0.865  0.875  0.878  0.880
 (*) no ISO VG grade

OSO 68 100 150 220 320
Viscosity at 40°C  mm²/s 68 100 150 220 320
Viscosity at 100°C  mm²/s 8.67 11.1 14.7 18.9 24
Viscosity Index  -  98  96 96 96  95
Flash Point COC  °C 220 228 238 265 270
Pour Point  °C -24 -24  -24  -21  -18
Mass density at 15°C  kg/l  0.885  0.890  0.895  0.897  0.900



  • The oils are designed for energy transmission in plants requiring the use of a hydraulic fluid. The oils also provide adequate lubrication by creating a strong lubricant film which withstands high loads between the sliding parts of high-pressure hydraulic systems.
  • AGIP OSO oils have very good antiwear properties, as illustrated by typical test results:
  • * vane and ring wear in the Vickers test around 35 mg;
  • * the higher grades (OSO 46-150) pass the 12th stage of the FZG test, while the lower grades pass the 11th.
  • They have extremely good oxidation resistance and stability even when subjected to unusually high thermal stresses; this property minimizes sludge and deposit formation, thus preventing blocking of ports, valves and controls, while guaranteeing that the oil remains properly fluid. Maintenance costs are therefore reduced and the useful service life of the oil is extended.
  • The high Viscosity Index of all grades minimizes changes in viscosity throughout the normal range of operating temperatures, thus ensuring constant flow, low friction loss and good hydraulic efficiency, while protecting against the possibility of cavitation.
  • They have a low pour point which allows easy start-up of hydraulic equipment even at low temperatures, without circulation or regulation problems.
  • Their outstanding anticorrosion and antirust properties inhibit the oxidation of internal surfaces of hydraulic circuits and therefore prevent operating difficulties and breakdown of the oil caused by metallic oxides that would otherwise form within the machinery.
  • Their good demulsibiliy prevents the formation of a stable emulsion between the oil and any water which enters the system through leakage or condensation. The fluids therefore maintain their lubricating power and anticorrosion performance even under these circumstances.
  • They show a very high filtrability; they are suitable for very fine filters (3 micron up to ISO VG 68)
Last modified on Tuesday, 26 May 2015 13:52

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