Red Bull Formula 1 advisor Dr Helmut Marko has given a cautious reaction to the team's strong pre-season testing in Bahrain.
Max Verstappen topped the opening day of running on Thursday and was set to repeat it on Friday until a late glory run by Alfa Romeo's Zhou Guanyu.
On Saturday, Sergio Perez set the fastest time of the test to go P1 as Red Bull cemented their status as 'the team to beat' going into the new season.
Despite the dominance in Bahrain, Marko still warned caution with a usual testing caveat.
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"Yes it went well," he told media including RacingNews365 in Bahrain.
"But putting things into perspective, we don't know how much fuel the others had on board, but the fact that the next closest car is four tenths [of a second] from us is encouraging.
"The way we started the test, it was the best first day of a test in Red Bull's history.
"Everything went smoothly and it was impressive how Max [and the team] managed to finish our [testing] programme.
"The problems on Friday were nothing serious, and that is what is so reassuring.
"From the filming day at Silverstone to the [final lap in Bahrain], nothing happened that we are worried about."
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