OST 38.01163-78

The petroleum-based MS-8p aircraft oil with a highly efficient additives package is a blend of Siberian and Uralian oils. This oil substituted the formerly used MK-8 and MK-8p oils and by far surpasses them with regard to a number of performance criteria, particularly, with regard to viscosity at low temperatures, thermal-oxidative stability and service life.

The MS-8p aircraft oil is used in gas-turbine engines of subsonic and supersonic aircraft (Il-62, Il-76, Il-86, Tu-134, Tu-154 and Yak-40 civil aviation aircraft, MiG-21, Su-15 and Su-25 military aircraft and Mi-6 and Mi-7 helicopters), whose oil temperature at the engine outlet does not exceed 150°C.

MS-8p is also used in compound oil mixtures for turbo-propeller engines (An-12, An-30, An-32 and Il-18 aircraft), and as a conserving agent for the aircraft engine oiling systems. Besides, MS-8p is used in marine (ship), gas-compressor plant and power plant gas-turbine engines.

Index nameNorm
Kinematic viscosity, mm2/с (cSt):  
at 50°С, min. 8,0
at minus 40°С, max. 4000
Closed flash point, °C, min. 145
Pour point, °C, max. -55
Thermal-oxidative stability at 150°C within 50 hours:  
a) kinematic viscosity at 50°C after oxidation cSt, max. 10
b) kinematic viscosity at minus 40°C after oxidation cSt, max. 5500
c) acid number after oxidation, mg KOH per 1 g of oil, max. 0,7
d) mass content of residue after oxidation, %, max. 0,15
e) corrosion on plates after oxidation, mg/cm2, max.:  
- SHH-15 steel in accordance with GOST 801-60 Absent
- M1 or M2 copper in accordance with GOST 859-66 ±0,2
- AK-4 alluminum alloy in accordance with GOST 4784-74 Absent


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