Its a pleasure for me to produce the proceedings of the 8th Arnold Tross Colloquium. The tribological colloquium took place at the 8th of June 2012 and was a very interesting and successful opportunity to interchange results from different tribological research.This year the contributions were focused on the university research. The topics covered a wide range of tribological problems. Fundamental investigations and applied tribology were discussed.A novelty this year was a scientific demonstration about hydrodynamic and elasto-hydrodynamic by Harry van Leeuwen from TU Eindhoven. He chaired the second part of the conference. Thanks again.It was also a conference enrichment to welcome again a scientist from University of Huelva.3 papers were engaged with bolted connections and investigated the friction situation. A very interesting example for the application of tribological knowledge.Machine elements like ball bearings, vehicle clutches and crankshaft journal bearings were investigated by numerical simulation and experimental work.And 2 papers concerned with special behaviour of lubricants and lubricated contacts.Prof.Dr. E.Kuhn