The article discusses issues related to the behavior of powertrains understood as monuments of engineering art. The theoretical part analyzed the most important issues related to the maintenance and renovation of vehicles, their share in Poland in the age category, as well as the regulations regarding the classification of historic vehicles. The next part of the article presents the renovation process of two powertrains - the K-750 motorcycle and the Volkswagen Type 117 passenger car, along with a short production history. Then, recommended procedures for unique objects were discussed in the context of their state of preservation and occurrence based on the authors' experience.
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