This work explores the integration of the CDIO framework within a third-year Mechanical Engineering course focused on manufacturing, with a focus on service learning. University students collaborate with peers from vocational schools to optimize manufacturing processes and materials selection, delivering impactful projects to social entities. The service learning component enhances the practical application of CDIO principles, emphasizing the societal impact of engineering solutions. The third-year Mechanical Engineering curriculum at Universitat Rovira Virgili introduces a distinctive approach by integrating CDIO principles with service learning. The projects, designed with a focus on service learning, culminate in the delivery of tangible solutions to social entities. In this combination of CDIO principles and service learning, the third-year Mechanical Engineering course becomes a crucible for transformative education. Graduates emerge not only with technical proficiency but with a heightened sense of social responsibility, teamwork, and adaptability, which are essential attributes for success in engineering with a societal impact. The vocational school students have the first contact with the university and motivate them to excel in the manufacture of the projects that are delivered to social entities. The projects stand as tangible proof of the CDIO-infused service learning journey, illustrating the potential of engineering to create positive change in communities.