Andrea Stella has put McLaren on the record as the loudest paddock voice arguing that Formula 1's 2026 power unit regulations need to be reopened — and that the practical target should be a 2028 reset, with the political decision finalised before the summer break.
The McLaren team principal, speaking at the Miami Grand Prix, framed the case in technical rather than competitive terms. McLaren is the reigning constructors' champion and has the least to gain from a regulatory shake-up, which makes Stella's position notable.
"Hardware adjustments to the power unit in order to improve Formula 1 in general, I personally think are required," Stella said.
He pointed at fuel flow as the route most likely to extract additional performance from the internal combustion engine without redrawing the entire 2026 architecture. "They will have to do realistically with the fuel flow to increase the power from the internal combustion engine," Stella said.
The lead-time argument is what pushes the proposal out to 2028. Stella was direct about the engineering window. "From the perspective of power unit manufacturers, I see this is difficult for 2027 because the implication for the battery size and the implication for coping with the higher fuel flow, they are normally a longer lead time than the time available to go into the 2027 season," he said. He then named the political deadline. "I would urge that possibly this conversation needs to be finalised before the summer break to be in time to do it for 2028."
Not every team principal agrees that the conversation should even be happening. Toto Wolff, whose Mercedes power unit currently sits at the front of the 2026 hybrid pecking order — Andrea Kimi Antonelli has won three of the first four races — was sharper than usual.
"Whoever talks about changing engine regs in the short term should question his way of assessing Formula 1 at that stage," Wolff said.
Wolff was, however, willing to accept the principle of a mid-cycle optimisation. "Can we tweak it and optimise it in the mid-term? I think absolutely," he said. "Whether we could extract a bit more performance out of the ICE… Great, give us enough lead time so we can actually do it."
Alpine sporting director Steve Nielsen sat between the two camps and was the one to spell out the chassis implications of any fuel-flow change. "More fuel means bigger a fuel tank, means a different chassis," Nielsen said — a reminder that the power unit conversation cannot be ringfenced inside the engine bay alone.
Nielsen also voiced an undercurrent that has been growing across the paddock since Bahrain. "We've seen a lot of regulation changes in the last few weeks. I hope it calms down a bit," he said.
The political backdrop matters. FIA president Mohammed Ben Sulayem has publicly committed to a V8 return for 2030, and that target is now driving the conversation about 2028 in two directions at once. One school of thought, championed by Stella, argues that adjusting fuel flow inside the current architecture is the cleanest way to bridge from 2026 to whatever comes after 2030. The opposing view, broadly Wolff's, is that any short-term tweak is a sunk-cost trap that distracts manufacturers from the long-term work of designing the next generation.
What is not in dispute is that the technical regulations group has a window — and Stella has now publicly defined its closing date. If F1's power unit politics are not settled before the August break, the 2028 option dies, and the choice becomes binary: live with 2026 until 2030, or accelerate the V8 transition into 2029. Either outcome carries costs that no team principal in Miami sounded ready to absorb.
For McLaren, the timing is sharper than most. Stella has the championship lead and the strongest customer-engine package on the grid, so any reset risks neutralising a hard-won advantage. That he is asking for one anyway is, for any other team principal, the most interesting part of the story.
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*Originally published on [News Formula One](https://newsformula.one/article/mclaren-stella-2028-power-unit-fuel-flow-change-summer-break-deadline). Visit for full coverage.*