A gearbox problem limited the track debut of Red Bull's newly-launched RB5 single seater to just 14 laps on Monday.

A gearbox problem limited the track debut of Red Bull's newly-launched RB5 single seater to just 14 laps on Monday.

At Jerez, Sebastian Vettel was at the wheel for a series of mostly installation laps before the car broke down.

A statement issued by the energy drink-owned team confirmed that the gearbox was the culprit, despite car designer Adrian Newey on Monday revealing that the gearbox internals were the only major carry-over components from last year's RB4.

"We stopped the car as a precautionary measure because the gearbox oil temperature was beginning to rise," team boss Christian Horner confirmed, on the same day that it was revealed that the French company Total is Red Bull's new lubricants supplier.

Again in German Vettel's hands, the RB5 will be back in action at the Spanish venue on Tuesday morning.

Monday's curtailed shakedown, however, was also interesting in light of speculation about the RB5's rear diffuser, amid the controversy surrounding Toyota and Williams' designs.

Every time Vettel returned to the Jerez pits, a mechanic covered the rear of the car with a custom wing-diffuser sheath.

 

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