A technique based on partial thin layer activation (PTLA) to measure on-line the wear volume of a laser textured surface (LST) Al-Si-Cu cylinder liner was presented. The couple cylinder liner and piston ring was put in reciprocating sliding motion lubricated with a small stream of oil flowing in the contact zone and bringing the removed wear debris to the radiation detector. This on-line technique allowed the evaluation of the removed wear volume and hence the wear rate during the different phases of the wear behaviors, i.e., running-in and steady state. Reduction in the friction coefficient for the LST samples was in the order of 5-7%. This is an abstract of a paper presented at the World Tribology Congress (Kyoto, Japan 9/6-11/209).