Formula One legend Niki Lauda says Mercedes should not get carried away with their success in testing before the 2014 Formula One season.

“There is no comparison (to actual racing). Everything is theory because you don’t know who has already played out how much of their resources,” he told the online edition of Auto, Moto and Sport magazine on Friday.

“Every time it comes down to the aerodynamics and the engine. The truth will be seen first in Australia,” added the three-time world champion.

The efforts of Mercedes drivers Nico Rosberg and Lewis Hamilton have been particularly impressive so far when compared to current world champions Red Bull who have struggled with car and engine problems.

The third and final pre-season test continues at the Sakhir track in Bahrain Friday before the campaign opens in Melbourne on March 16.

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