This paper investigates German /l/-vocalization in the dialect region of South/Central Bavarian. In Austria, /l/-vocalization is said to be restricted to Central Bavarian, constituting the most salient dialect feature. However, its existence within the transition zone of South/Central Bavarian, including the urban and surrounding area of Graz, is often assumed. By analyzing natural speech data of different age groups from Greater Graz in a formal and an informal communication situation, we see that /l/-vocalization is already a well-established phenomenon, whereby the older age-group vocalizes considerably more often than the younger one. This suggests that /l/-vocalization serves as a sociolinguistic rather than a dialect marker indicating regional identity.