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The purpose of the research presented in this article was to determine the impact of the storage period of engine and transmission oils on their operational properties. Prolonged storage of oils leads to a series of physicochemical changes that can significantly affect their lubrication efficiency. Changes such as reduced viscosity, changes in density, and deterioration in lubricity can lead to increased wear of the engine, transmission, and other mechanical components. The study included samples of new and five-year-old engine and transmission oils, as well as engine oil after the break-in period (with a mileage of approximately 800 km). The results do not clearly indicate that the oils tested lose their original lubricating properties to the same extent in all cases. The conclusions of the study vary depending on many factors, and the impact of time on the properties of oils is diverse. The article emphasises the importance of proper storage conditions for oils and the need to regularly monitor expiration dates to ensure optimal protection of mechanical systems in vehicles and machinery.