Today, modern tribodiagnostics offers sophisticated analyzes of motor oils with fast and accurate results. However,Today, modern tribodiagnostics offers sophisticated analyzes of motor oils with fast and accurate results. However,finding the causes of some undesirable processes of engine oil degradation often requires long-term monitoring of the operatingfacility. In this case, it was a problem of diesel engine oil in the Citroёn Jumpy 2.0 HDi service minibus, which has been in useby the Department of Mechanical Engineering (Armed Forces Academy of General M. R. Štefanik, Demänová) for more than13 years. The fuel system (conditioners of injectors) on this vehicle has also been monitored for a long time in the period 2019-2021, an article about it was also published in the journal Science & Military (No. 2 / Vol. 14/2019). The cadets of theDeptartment of mechanical engineering Armed Forces Academy of General M. R. Štefanik, were also involved in the diagnosticprocess. In parallel with the fuel system, the quality of the engine oil was regularly monitored in the time interval 20.1.2020 -22.4.2021 at a start of 2185 km from the last oil change. During this monitoring, a very rapid degradation of engine oil wasfound in some parameters, which is atypical during normal vehicle operation. This article discusses the measured results andpossible causes of this adverse event.

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Solution of the replacement of plastic lubricants of the Mobil-NLGI 00 type (to the PSU-planetary directional device) and Total-NLGI 0 (to the KP-final gear) for the MAPU-1 (in PSU) and MAKN-2 (in KP) lubricants. The design of plastic lubricants was performed in cooperation with Armed Forces Academy of General Milan Rastislav Štefánik represented by Ing. Miroslav Marko, PhD. and CMaS ZZ II Žilina, represented by Ing. Stanislav Kolomazník within the Project VV-1/2018 to 2020. Testing of PM (plastic lubricants) was performed on a special vehicle type GM 578. After changing MAPU-1 and MAKN-2 lubricants for PM (NLGI 00 and 0) and running 197 km was carried out “1. Check collection”. Further inspections will follow in the next period. On behalf of Armed Forces Academy of General Milan Rastislav Štefánik, Major was also actively involved in tribodiagnostics Ing. Vladimír Kadlub and Capt. Ing. Pavol Lukášik.

Within the Project VV1 "Design and application of tribodiagnostic methodologies for operation and maintenance of ground equipment of the Armed Forces of the Slovak Republic in the years 2018 - 2020, she was performed motor oil (MO) sampling series and property measurement series (MO) PETRONAS URANIA FE LS, SAE 5W-30, (O-1178), in IVECO CROSSWAY vehicles. The aim was to perform on the basis of the performed experimental measurements experimental verification of parameters of operating substances and materials of newly introduced ground military equipment.