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TNK GEO PLUS 15W-40 Gaz Engine Oil



TNK GEO Plus 15W-40 – low ash content engine oil for four-stroke gas engines of mobile machinery running on compressed natural gas (methane) and installed in buses and municipal facility vehicles, and in other vehicles.

The application of modern conventional high ash-content motor oils in engines, and especially in those running on natural gas, is not feasible. Ash components cause increased formation of lacquer and carbon deposits on cylinder and piston group parts and surface ignition. Separation of solid ash deposits causes damage to combustion chamber inner surface, plugs and exhaust valve. TNK GEO Plus 15W-40 contains a special additives package, distinctive of its low ash content, which prevents high temperature deposit formation in combustion chamber, valve burn-out and improves performance of ignition plugs.


TNk GEO Plus 15W-40 offers the following advantages:

  • Specially balanced composition of detergent and dispersant additives with low ash content provides for high purity of cylinder and piston group, reduced filter consumption and long service life due to high resistance to oil oxidation and nitration
  • Low ash additives do not cause carbon and ash deposits formation on pistons, intake and outlet ports, rings, grooves, piston crowns and skirts, valves and in combustion chambers, preventing surface ignition
  • TNK GEO Plus 15W-40 high performance additives package provides for efficient operation on highly contaminated gas.



TNK GEO Plus 15W-40 complies with API CF. Approved by KAMAZ.


Kinematic viscosity at 100 °C , mm2/s


Dynamic viscosity CCS at -20 °C, mPa⋅C


Viscosity Index


Density at 15 °C, g/sm3


Sulfated ash, % mass


TBN, mg KOH/g


Flash point COC,°C 


Pour point,°C 


NOACK test, %



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