Scania is one of the leading manufacturers of heavy-duty trucks worldwide. The engines designed for these vehicles constitute an important sector of this company’s product range. Scania treats the development of their engines with particular care. High expenditure on research and development as well as long established tradition make this product unique in many ways. These engines comprise experience, durability and novelty and that is why the Scania engines conform to the most stringent standards and market requirements. The paper presents a concise history of the development of the truck engines that are only a part of the company’s production beside industrial and marine engines. The history of the Scania engines shows how a combustion engine developed throughout decades, particularly diesel engines. This paper also proves that such a development is not only still possible but also quick, bringing measurable results.