Having fallen foul of a reliability glitch, Nico Rosberg says he is optimistic but not confident of Merc being "bullet proof" for Melbourne.
The German was in action on Day One at the Sakhir circuit in Bahrain and completed 89 laps with a best time of 1:36.624.
His day, though, was not without problems as an issue in the afternoon curtailed his running.
"I managed to do a couple of good laps, but in the afternoon we had a few reliability problems," he told to Autosport.
"It just shows everyone is fully on the limit.
"OK we're looking a little better on reliability than some others, but even we're on the limit and having problems.
"To get everything ready...
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