Editorial 1 Tribologie + Schmierungstechnik · 70. Jahrgang · eOnly Sonderausgabe 1/ 2023 DOI 10.24053/ TuS-2023-0025 Dear readers, in the world of industrial maintenance, the professional use of lubricants and their service and monitoring is no longer just an option, but a central element for success and sustainability. This issue is dedicated to the innovations and challenges in the field of lubricants, operating fluids and condition monitoring. Find out how modern lubricants not only extend the service life of machines, but also contribute to reducing the CO2 footprint. Be inspired by expert opinions and practical examples to meet the challenges of the future with a wealth of knowledge. Rüdiger Krethe Editorial