TSP-15K oil (GOST 23652-79) is a residual oil with a small addition of distillate oil and a composition of additives that improve extreme pressure, antiwear, low temperature and antifoam properties. It is used for the gearbox and main transmission (two-stage reducer with cylindrical and spiral-bevel gears) of KAMAZ vehicles and other trucks. TSP-15K oil retains its properties for a long time within the temperature range from -20 to + 130°С.

Physical and chemical indicators of Transmission oil TSP-15K (GOST 23652-79)
| Name of the indicator | Norm GOST (TС) |
|---|---|
| Viscosity: | |
| dinematic viscosity, mm2/s, at 100°С, not less than : | 10,0 |
| dynamic viscosity, PA, at-45 (-35)°С, not more than | 300 |
| Viscosity index, not less than | 90 |
| Temperature, °С: | |
| flash point in the open crucible, not less than | 128 |
| pour point, °C, not more than | -40 |
| Acid number, mg KOH/g, not more than | - |
| Mass fraction, %: | |
| mechanical impurities, not more than | 0,02 |
| water | Traces |
| sulfur (chloride), not less than | 1,6 |
| phosphorus, not less than | - |
| Corrosion test on steel and copper plates | Withstands |
| Tribological characteristics on ChShMT: | |
| Scuff index, N, not less than | 470 |
| Wear index at load 393 N, (20°С), 1 h, mm, not more than | - |
| Welding loading, N, not less than | 3479 |

