HOCKENHEIM, Germany - Mercedes is so happy with its drivers that the team can imagine keeping Lewis Hamilton and Nico Rosberg on board "until the cows come home".Team boss Toto Wolff's comments were made the day after German Rosberg's new contract was announced, apparently a three-year extension.The same reports say Rosberg's pay has been doubled to the equivalent of about R800-million to put him on par with Briton Hamilton's pay packet.'HEALTHY RIVALRY'Wolff was quoted by Germany's Die Welt newspaper as saying: "The balance in the team is more important than anything else."On the face of it Hamilton and Rosberg have been clashing personally through 2014 as they battle for the 2014 crown with the dominant W05 cars but Wolff indicated that he saw Mercedes' pairing as similarly competitive but far more harmonious than many other potential driving combinations."We have deliberately avoided saying just how long the contract is," he insisted, "but in the best case we all stay together until the cows come home," Wolff smiled.Rosberg was also happy to give the impression of relative harmony with Hamilton, despite his rival saying recently that Germany is not really his home race.Rosberg said on Wednesday (July 16 2014): "The interviewer started it as a joke and my team mate then played along. I have no problem with that. We have a healthy rivalry as we fight every single race weekend for the win."That is precisely the challenge for which I am involved in motorsport."Stay with Wheels24 for the 2014 German GP this weekend.