![]() However, due to use, the engine oil degrades, the additives necessary for the performance of the required functions are reduced, and the percentage of undesired particles increases due to wear or the penetration of impurities from the outside. The appropriate change interval is specified by the manufacturer of the machine or engine oil. It is necessary to change the oil filling at the defined intervals so that the engine (or the whole machine) will operate correctly for a long period of time. It must lubricate and adhere well to the lubricated surface, protect metal surfaces from corrosion, seal the combustion chamber, dissipate heat caused by friction, ensure the dispersion of soil and prevent their settling, and allow operation during extreme temperatures. The oil must perform several functions in the engine. The choice of suitable engine oil has a crucial effect on the operability and long-term operation of the engine. Due to the high yields of crops, farmers can lose a significant amount of product when a tractor is not functioning during the harvest period. In addition, a risk analysis of the outage was performed. Based on the processing and evaluation of these analyses, the overall condition of the oils was assessed and subsequently the optimal exchange interval of the examined oils was determined. The measured values were compared to the limit values. Lastly, the content of water, fuel, and glycol and the products of oxidation, nitration, and sulfation were determined by using infrared spectrometry. Furthermore, the concentrations of abrasive metals, contaminants, and additive elements were measured using an optical emission spectrometer. The physical properties of the examined samples were first determined by conventional instruments. ![]() The primary goal of the paper is to determine the appropriate replacement interval for these oils. This article focuses on the issue of motor oils used in the engines of non-road mobile machinery (NRMM), more specifically tractors.
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