Green’s Dictionary of Slang

(Aus.) a service station.

1999		G. Seal Lingo 78: Particularly in Sydney, servo for service station seems to have crept into use in the early to mid-1990s.
2005		P. Temple Broken Shore (2007) [ebook] Cobham. The BP servo. Three in the ute.
2012		A. Savage ‘Killing Peacocks’ in Crime Factory: Hard Labour [ebook] At the servo I ordered a coffee.
2016		Facebook 15 July 🌐 After seeing the rellies and borrowing a quid we got some snags from the servo and headed home to my kid.
2020		D. Whish-Wilson Shore Leave 101: The servo just inside the Bayswater Bridge.
2023		D. Whish-Wilson I Am Already Dead 121: ‘I’ve got eyes and ears at all the motels, the country servos and campgrounds’.