Mark Webber has insisted that Red Bull doesn't know if the new RB8 is strong enough to win going into the new F1 season, which gets underway this weekend in Australia.
The team was unsurprisingly on the pace during pre-season testing and goes into the season opener being widely tipped as the team to beat for the third straight year.
However, the final test of the winter didn't go without its problems, with a gearbox issue on the final day restricting mileage for Webber's team-mate Sebastian Vettel.
While he admits that Red Bull's aim is to maintain its run of success during the year ahead, Webber said it would be far from easy against the rest of the field with every team having shown strengths and weaknesses for 2012.
“Performance-wise, we're a team aiming to win, and we know it's a very challenging season ahead against a lot of good, ambitious teams,” he wrote in his BBC Sport
column. “Mercedes, Ferrari and McLaren all need to win. It's going to be fascinating how it turns out.
“It's been incredibly rewarding for the team to be at the level we have been for the last two years, but it doesn't take much to fall off. We work to fine margins in F1, and you might not be as comfortable as you were in the past.
“At this stage, we really don't know if we have done enough. Clearly, we'll be competitive. But whether we're strong enough to win remains to be seen.
“What we have been able to work out from testing is that all the teams have strengths and weaknesses - including us. “