Aviation Oil MS-8p

Aviation Oil MS-8p (OST 38.01163-78) —is the most widely used petroleum-based oil with a complex of highly effective additives. It’s produced from West Siberian and Ural petroleums. This aviation oil is applied to gas-turbine engines of subsonic and supersonic planes at which temperature of oil at the outlet of the engine no more than 150°C. In addition, MS-8p aviation oil is used as part of oil mixtures with MS-20 aviation oil (in the ratio of 25:75, 50:50 and 75:25) in turboprop engines, as well as for the preservation of aircraft engine oil systems. MS-8p oil is used in ship gas turbines and in gas pumping units.
MS-8p oil is developed instead of MK-8 and MK-8p oils, it considerably surpasses them in a number of operational indicators, in particular, in viscosity at low temperatures, thermo oxidizing stability, service life.

Due to the design features of gas turbine engines (GTE), the operating conditions of aviation oils in them differ significantly from the operating conditions of the same aviation oils in reciprocating engines. Unlike a reciprocating engine, aviation oil in the gas turbine engine is isolated from the combustion chamber (fuel combustion zone); in addition, in the most responsible friction units, rolling friction is realized, not sliding, as in reciprocating engines (the coefficient of rolling friction is substantially lower than the coefficient of sliding friction). The shaft of the turbocharger in the gas turbine engine is well balanced and at high speed and high axial and radial loads works without sharp variable loads.

Physical and chemical indicators of MS-8p oil

Name of the indicator Norm GOST (TC)
Kinematic Viscosity, mm2/s:
at 50°С, not less 8,0
at -40°С, not more 4000
Flash point, °С:
in the closed crucible, not less 145
Pour point, °C, not more -55
Acid number, mg KOH/g of oil, not more 0,05
Content of water-soluble acids, alkalis, water, mechanical impurity Absence
Thermal oxidative stability, h (t ,°С) 50(150)
Indicators after oxidation:
Kinematic Viscosity, mm2/s, not more
at 50°С 10,0
at -40°С 5500
Acid number, mg KOH/g of oil, not more 0,7
Mass fraction of a deposit, insoluble in an isooctane, %, not more 0,15
Corrosion on plates, g/m2, not more:
ShH-15 steel Absence
M1 or M2 copper ±0,2
AK-4 aluminum alloy Absence
Density at 20°С, kg/m3, not more 875
Tribological characteristics on ChShMT at (20±5)°C:
critical loading, N, not less 490
wear indicator at axial load of 196 N, not more 0,55