Oilmix SM-4,5 (TU 0253-007-39247202-96) is a mix of aviation oils MS-8P and MS-20 in the ratio 75:25 (мас. A share of %).
It is intended for application in planes with turbo-propeller engines of type AI-20, AI-24.

Viscosity kinematic at 50°С, mm2/with: 4
Viscosity kinematic at-30°C, mm2/with: —
Viscosity kinematic at-40°C, mm2/with: —
Viscosity index, not less: —
Flash temperature in an open crucible, not more low, °С: 138
Hardening temperature, not above, °С:-35
Density at 20°С, kg/m3, no more: —
Acid number, no more: 0.05

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.