 At the completion of the 2004 season, Reindler competed in his first international event, the one-off Bahrain F3 SuperPrix, racing for the Swiss Racing Team.He finished 18th in what was regarded at the time as the unofficial World Championship for Formula 3 - select drivers from this event went on to winning championships in Formula 1, WEC, DTM, Super GT and Super Formula to name a few.Reindler moved to Britain in 2005 to complete a part-season of the British Formula 3 Championship with Alan Docking Racing, commencing at round 7 at Monza, Italy, finishing 7th and 10th on debut.