GPI Series oils are designed specifically for hydraulic drives on the experience of firms, "VAZ" and "Fiat" and contain additives to improve performance. Industrial oils with high impurities are recommended only for irresponsible systems. Therefore, any oil must be filtered with a subtlety not worse than 25 microns, oil cleanliness class – no coarser than 12 and even 13 under GOST 17216-71. Keep it should be in closed containers and carefully protected from being hit by dust, moisture and pollutants (especially abrasive or solid particles and objects that could clog the valves and oil lines). At a temperature of -10 …- 15 C should be more viscous oil (AND 20 AND 20A, MGE, etc.) at low temperatures down to -40 C – less viscous (EL, q VMGZ etc.). Recommended grade oils are listed in the technical documentation MPI. The use of other brands of oil should be coordinated with the manufacturer. It should be keep in mind that here and below are the usual (old) designations brands of oils.
According to GOST 17479.3-85 new designation for hydraulic oil, used as working fluids for hydraulic systems of machines was cited above in 1.8,10.1 and 11.10. The design of hydraulic MPI includes a number of special assemblies and components (lip seal, seals, rings, valves, pump plunger pairs, etc.), working under great pressure working fluid. Therefore, the reliability of hydraulic machines, the ability to develop large forces at relatively low weight and high efficiency primarily depends on the failsafe of the listed items from their right of assembly and good condition.