The grease STP-Z (TU 38 УССР 201232-81) is a petroleum oil solidified with oktol and tar oil. It contains antiwear additives.  Is winter grease and it is efficient at temperature -50°С…+50°С. The grease STP-Z used in tooth gearings of traction reducers of diesel locomotives. Substitutes: Transol-100, Transol-200.
Appearance and colour: —  Viscosity effective, Па.с, at 0°С, no more: —  Viscosity effective, Па.с, at-30°S, no more: —  Strength at 50°С, the Pas, not less: —  Drobfall temperature, °С, not more low: —  Colloid stability at loading, %, no more: —  The content of free alkali in recalculation on NаОН, %, no more: —  Penetration at 0°С, mm, 10-1: 80-100  The content of water, %, no more: —  Vaporability at 100°С within 1 hour, %, no more: —
Data on operational temperatures represent values which are guided by a structure of lubricants, and also on a scope and technology of use. Depending on a kind of mehaniko-dynamic loading lubricants change the consistence, conditional viscosity or viscosity at various temperatures, pressure and duration of operation. These changes of indicators can affect work of components.