The Lăstun, also named "Dacia 500", was a cost-effective Romanian car for urban transport built between 1986 and 1992. It featured a two cylinder air-cooled engine of 499 cc, producing 22.5 hp, with a fuel consumption of and having a maximum speed . The Lăstun was built in Timişoara, Romania, although it was sold as a Dacia, and was manufactured in small numbers. The body was of glassfibre, and was not dissimilar to that of the Lancia Y10. An enhanced bodywork prototype 500 Lăstun was also made, and exhibited at the 1989 Bucharest trade fair. There was also a luxury prototype made in the early 1990s, with hubcaps, body-coloured bumpers, and head restraints. The advertising slogan was "Un Autoturism de Actualitate" (A Modern Vehicle). The name means literally in Romanian "House Martin", which is a small bird related to the swallows.
Due to its small size and low quality the Lăstun was subject to many jokes. Few have survived, and the number on the road has been estimated to be in the low hundreds. It was never exported.
Also the small 0.5L engine had some carburateur break-downs, which brought the average petrol consume to almost , making the car more less effective than the long time produced 1300 series.