Sebastian Vettel says Formula 1’s hybrid power units are fascinating works of engineering, but they offer no real upside for drivers and fans.

Vettel’s Russian Grand Prix came to an abrupt end last Sunday after his Ferrari engine suffered an MGU-K failure, an issue that led the disappointed German to quip over the radio: “Bring back f**king V12s”, referring to F1’s older generation of engines.

The Scuderia driver later admitted that his remark simply reflected his frustration at the time of his retirement, and was not a call to return to the past.

“In that moment, obviously it was very bitter, because up to that point I thought I drove very well and it was looking like a good afternoon,” he said.

“The first reaction when the car breaks down is not always the happiest one.”

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Vettel acknowledged the engineering feat represented by F1’s current breed of V6 turbo-hybrid engines, but doubted they added much value to the spectacle on the track.

“These power units are very complex from an engineering point of view, very fascinating, but obviously I have my stand on it,” Vettel said.

“I don’t think it comes with a great upside for us racing and people watching.”

©Ferrari