Classic Ads: Renault 18 / The Renault 18 was conceived as a replacement for the successful, but ageing, 12 family saloon. It was Renault’s first true “world” car and was sold in many different territories across the globe. Although Renault tried to make a big thing of the 18’s newness, the fact that it went so quickly from concept to production model – just 18 months, in fact – belied the fact that it was, in fact, based on the same underpinnings as the antiquated 12. / by AutoTrader.co.uk