a prototype Mark 4 body. The revisions to the body were minor, and the most noticeable were a return to four-piece sliding windows to improve ventilation and to 203mm high route numbers at both the front and rear after the 127mm examples proved unpopular. The Mark 3 body was also used on 30 O305G articulated buses. A trial unit was delivered in September 1981 followed by the production units between September 1983 and May 1984. A fleet of 355 Mark 4 O305s were delivered between July 1984 and August 1987. The chassis on these was slightly revised, being fitted with ABS. Withdrawals commenced in 1989 with the final examples withdrawn in October 2012. At the time of withdrawal, some of these buses had accumulated more than 1 million kilometres of service. Canberra ACTION took delivery of a fleet of 85 Ansair bodied Mercedes-Benz O305s between November 1981 and March 1985. They were built with standard Mercedes-Benz "StULB" fronts. After being refurbished in the early 1990s, the first were sold in 1995 and then at several other intervals until 1999. All were sold to private bus companies mainly in the Sydney and Melbourne metropolitan areas with 12 being exported to New Zealand to operate in Auckland and Wellington. Ansair also bodied five Mercedes-Benz O305G articulated buses between February and April 1983. These were sold in 1997/98 to private bus companies around Australia. Adelaide The State Transport Authority purchased 41 O305 and 51 O305G articulated buses for service on the O-Bahn Busway. The chassis were heavily modified at the Mitsubishi Motors plant in Tonsley. The rigid buses had their power increased to 240 hp (177 kW) and the articulateds to 280 hp (207 kW); they were the first buses to travel at a speed of 100 km/h on suburban routes. New Zealand Auckland Auckland Regional Authority and its successors had a fleet of over 300 Mercedes-Benz O305 buses which remained in use until 2005. Many of these were sold to other bus operators or converted for other uses including mobile homes. All were fitted with New Zealand Motor Bodies bodies, VoV bodies built under license. After serving the city of Auckland, some were rebuilt with low-floor bodies by DesignLine and Fairfax Industries, for further suburban use. New Plymouth New Plymouth City Transport purchased seven Mercedes-Benz O305 buses over two orders: 4 purchased in 1976 (on the back of the Auckland Regional Authority