Mercedes boss Toto Wolff has echoed Ferrari's Frederic Vasseur in dismissing premature excitement over a potential V10 engine comeback in Formula 1.
F1 CEO Stefano Domenicali floated the idea last year, with FIA president Mohammed Ben Sulayem recently agreeing that sustainable fuels could enable a shift to loud, light naturally-aspirated engines.
Red Bull's Christian Horner supports it. "The pure racing fan in me would love to see a return to V10 engines, if it were done responsibly and with sustainable fuel," he said.
Vasseur, however, urged focus on the present. "It is too early to talk about the engine regulations of 2030 or 2031," he said, with 2026's even more hybrid-heavy 'power units' looming.
"We have not yet introduced the next generation of engines and there are still some huge issues on the table in this regard. We should focus on that first."
Wolff concurred, prioritising the upcoming rules. "We are pushing the boundaries of battery technology and, in terms of sustainability, this (2026) is the first year that we have 100 percent sustainable fuel," he said.
"Nobody knows what all this will lead to. F1 is a pioneer. All stakeholders should be happy about that and make sure that the sport is seen as the high-tech sport that it should be. At the moment, I think that is a bit premature."
He warned against diluting F1's message: "We risk drowning out the message that we want to send to the world if, a year before the new regulations, we talk about something that will come much later."
