FIA Confirms Mercedes Engine Upgrade Amid Rival Complaints

Key Points

• The FIA has confirmed that Mercedes will receive engine upgrade opportunities in the 2026 and 2027 seasons under the new Additional Development and Upgrade Opportunities (ADUO) system.
• Red Bull’s power unit was rated the strongest in the first assessment period, which covered the opening five rounds of the season.
• Mercedes fell within the “two to four per cent” performance window, earning one additional homologation in 2026 and another in 2027.
• Audi, Ferrari and Honda were more than four per cent behind Red Bull, giving each manufacturer two additional homologations in both 2026 and 2027.
• No manufacturer received further upgrades after the second assessment period, which ended at the Hungarian Grand Prix.
• Red Bull driver Max Verstappen and Mercedes team principal Toto Wolff have both publicly questioned the FIA’s findings and processes.
• FIA director of single-seater matters Nikolas Tombazis defended the “robust” data analysis behind the decisions.
• Mercedes’ Kimi Antonelli currently leads the drivers’ championship, while Mercedes also tops the constructors’ standings.
• The third ADUO assessment period began at the Dutch Grand Prix and will end at the Mexico City Grand Prix on 1 November.
• The Italian Grand Prix at Monza will be broadcast live on Sky Sports F1 from 4-6 September.

Monza (Britain Today News) August 27, 2026 — The FIA has confirmed that Mercedes have been granted permission to introduce further engine upgrades for the 2026 and 2027 seasons, a decision that has reignited tensions among rival power unit manufacturers over the fairness of the sport’s new engine equalisation process.

Why Did The FIA Introduce The ADUO System?

Following the introduction of all-new engine regulations for the 2026 season, Formula 1’s governing body implemented the Additional Development and Upgrade Opportunities (ADUO) system. The mechanism was designed to allow manufacturers who fall behind the sport’s benchmark power unit to catch up during the course of the current rules cycle, ensuring competitive balance is maintained across the grid.

What Did The First Assessment Period Reveal?

It emerged in June, after the conclusion of the first assessment period covering the opening five rounds of the season, that the FIA had adjudged Red Bull to possess the strongest engine on the grid. As a result, upgrade opportunities were granted to Mercedes, Ferrari, Audi and Honda.

The FIA did not disclose these findings to the media directly at the time. However, teams and drivers confirmed the outcome in public comments, and a leaked document further corroborated the results before any official confirmation was made.

Why Was The Initial Ruling Considered Controversial?

The decision proved contentious within the paddock, largely because the consensus among rivals was that Mercedes did not require assistance. The Brackley-based works team had won the first six Grands Prix of the season, prompting scepticism over why they should be handed an upgrade opportunity at all. Red Bull, by contrast, had managed just a single podium finish in the same period, raising fears the Milton Keynes squad could lose further ground to their competitors.

What Did Max Verstappen Say About The Findings?

Red Bull driver Max Verstappen was among those who spoke out against the FIA’s conclusions, voicing his scepticism over the process that had determined his team’s power unit to be the strongest on the grid despite their comparatively modest results at the time.

What Did Toto Wolff Say About Mercedes’ Power Unit?

Mercedes team principal Toto Wolff added further intrigue to the debate in July when he made a bold claim about his team’s power unit performance. Wolff stated that his team have

“the most powerful power unit.”

His comments raised additional questions over the FIA’s evaluation process, given that Mercedes were simultaneously being granted upgrade opportunities intended for manufacturers trailing the pace-setting engine.

What Has The FIA Now Confirmed For Both Assessment Periods?

Following the conclusion of the second assessment period, which ran up to and including the Hungarian Grand Prix ahead of Formula 1’s summer break, the FIA has now formally announced its findings for both periods.

In an official statement, the FIA said:

“For the first period: Mercedes were determined to be in the two to four per cent window, and will thus be allowed one additional homologation in 2026 and an additional one in 2027, together with corresponding cost cap and dyno testing increases.”

The statement continued:

“Audi, Ferrari and Honda were determined to be above four per cent, and will thus be allowed two additional homologations in 2026 and two in 2027, together with corresponding cost cap and dyno testing increases.”

While this element of the announcement served largely as confirmation of details that had already been leaked back in June, the FIA’s findings from the second assessment period delivered a further setback for Red Bull.

What Did The Second Period Findings Mean For Red Bull?

Had any rival manufacturer’s upgrades introduced since June been judged to have pushed their power unit’s performance beyond that of Red Bull, the Milton Keynes team could have become eligible for an upgrade opportunity of their own.

However, the FIA’s statement made clear this was not the case, confirming:

“For the second period, no additional homologations were granted to any of the Power Unit Manufacturers.”

This outcome means Red Bull are, at minimum, considered to be performing within two per cent of the benchmark engine, and could still be regarded as possessing the strongest power unit on the grid overall.

How Are The Drivers’ And Constructors’ Championships Shaping Up?

Mercedes’ Kimi Antonelli currently leads the drivers’ standings, holding a 59-point advantage over both his teammate George Russell and Ferrari’s Lewis Hamilton. Max Verstappen, meanwhile, sits sixth in the standings, some 130 points adrift of the Italian outfit.

In the constructors’ championship, Mercedes hold an 87-point lead over second-placed Ferrari. Third-placed McLaren, who use Mercedes power units, have also found strong recent form, with reigning world champion Lando Norris winning the previous two Grands Prix.

Have Mercedes Already Used Their Upgrade Opportunity?

Mercedes have been permitted to use their 2026 upgrade opportunity since the first-round results were communicated back in June, though it is not believed they have yet done so. Ferrari, Audi and Honda, by contrast, are understood to have already introduced one of their two permitted upgrades for the 2026 season.
Explore More about Sports:
FedEx Cup to be determined by Tour Championship while Europe starts crucial phase at British Masters
An English petrolhead constructed a street-legal sports car in his shed for $7,000

What Has The FIA Said In Defence Of Its Process?

FIA director of single-seater matters Nikolas Tombazis addressed the scrutiny surrounding the ADUO system directly, defending the integrity and rigour of the governing body’s analysis.

Tombazis said:

“The FIA has undertaken thorough and exhaustive analysis as part of our ADUO review process.”

He added:

“With the release of the findings of period two, we are confident that, based on the quality of the data, its analysis is incredibly robust, giving us a high level of confidence in our findings.”

Tombazis also acknowledged the sensitivities involved in publishing such findings, noting:

“We also have to respect the confidentiality and intellectual property of the teams and their Power Unit Manufacturers in disseminating any details from the findings.”

He concluded by suggesting the process may be refined in future seasons, stating:

“This is the first year of ADUO so naturally there are areas which we may evolve, in discussion with all the PU Manufacturers.”

What Happens Next In The ADUO Review Process?

The third ADUO assessment period officially commenced with the Dutch Grand Prix and will run through to the Mexico City Grand Prix on 1 November. This period will determine whether any further upgrade opportunities are granted before the conclusion of the 2026 season, with particular attention likely to focus on whether Red Bull’s continued strong showing in engine performance terms persists as rivals introduce their sanctioned upgrades.

Where Can Fans Watch The Next Race?

Formula 1 fans wishing to follow the next chapter of this ongoing engine development story can watch the Italian Grand Prix live from Monza on Sky Sports F1, with coverage running from 4-6 September.

The coming months, and particularly the outcome of the third ADUO review period, are likely to prove decisive in determining whether Red Bull retain their status as the benchmark power unit manufacturer, or whether the upgrades already granted to Mercedes, Ferrari, Audi and Honda begin to close the gap at the front of the field.