Mercedes is considering introducing its ADUO engine upgrade at the 2026 Italian Grand Prix, with encouraging dyno results suggesting that the revised V6 can deliver both increased performance and improved reliability. Engineers at Brixworth are pushing for the development to make its debut at Monza, partly in response to Ferrari’s planned introduction of the more powerful 067/6 power unit.
The decision could have significant consequences for Mercedes’ championship campaign. Although the team reached the summer break with commanding leads in both standings, reliability problems have already cost George Russell and Kimi Antonelli important points. Mercedes must now decide whether to use its permitted upgrade immediately or preserve the opportunity for its 2027 power unit.
Mercedes engine upgrade could arrive at Monza
Toto Wolff has admitted that Mercedes possesses the most powerful engine in Formula 1. Nobody in the paddock had seriously doubted its performance, although the FIA’s ADUO assessments had identified the Red Bull-Ford V6 as more competitive than the Mercedes unit. That evaluation resulted in the German power unit receiving permission for an update.
The admission made by Toto Wolff during the Belgian Grand Prix at Spa-Francorchamps did not alter the situation. The FIA completed the second phase of its data collection during the Hungarian Grand Prix, a process that is expected to lead to another review of the ADUO calculations.
Toto Wolff reportedly did not initially want Mercedes to use its engine-upgrade allowance this year. The intention was to exploit the opportunity on the 2027 power unit, based on the belief that the current specification would be sufficient to win both the Drivers’ and Constructors’ championships comfortably.
Mercedes entered the summer break with a substantial advantage after securing eight victories and ten pole positions across the opening 11 Grands Prix. However, the numbers do not yet guarantee either championship. Kimi Antonelli leads Lewis Hamilton by 50 points in the 2026 Formula 1 driver standings, while Mercedes holds a 72-point advantage over Ferrari in the Constructors’ Championship.
Reliability remains Mercedes’ greatest concern
Those margins provide plenty of reason for optimism, but underestimating the risks would be a serious mistake. Power-unit reliability remains the major concern that Mercedes must monitor throughout the second half of the season, as Toto Wolff has already acknowledged despite Kimi Antonelli’s 50-point championship lead.
Both works drivers have already lost valuable points. George Russell suffered a battery failure in Canada, while the same problem stopped Kimi Antonelli in Barcelona during the Catalan Grand Prix. The British driver’s third engine then failed at the end of qualifying in Hungary. Mercedes technicians declared the unit beyond repair after it lost water from the cooling system.
George Russell also experienced another start-system bug at the Hungaroring, sending him towards the back of the field. The software problems affecting energy management have primarily compromised the Briton, although Kimi Antonelli has not been entirely immune. The setbacks contributed to a particularly difficult weekend before George Russell admitted he needed the summer break.
Mercedes had hoped to reach the middle of the season with both drivers at the top of the championship, fighting each other for the title after establishing a clear advantage over their rivals. Under that scenario, the team did not expect to need an aggressive W17 development programme during the second half of the calendar.
Instead, the situation developed differently. James Allison and Simone Resta continued working on the black-and-silver car, while Mercedes engine chief Hywel Thomas concentrated on resolving the hybrid-system problems.
Kimi Antonelli could require a fifth engine
The result is that Mercedes has used one more engine per driver than Ferrari. Kimi Antonelli has already introduced his fourth power unit of the season, making it increasingly likely that the Bologna-born driver will need to homologate a fifth engine and accept a grid penalty before the end of the campaign.
Toto Wolff would prefer not to make that change at the Italian Grand Prix, which represents Kimi Antonelli’s home race. Ferrari, however, intends to introduce the power unit developed with its second ADUO token at Monza, having already intensified reliability testing for its planned engine upgrade.
“On paper, it seems to be the best event at which to take the penalty; otherwise, Baku could be another possibility,” Toto Wolff explained. “Perhaps we could choose that one to take the pressure away from Monza and avoid forcing Kimi to start from the back in front of his home crowd.”
Positive results from Mercedes’ ADUO V6 tests
Dyno testing of the ADUO V6 is nearing completion at Brixworth, the headquarters of Mercedes AMG High Performance Powertrains, and the indications emerging from the engine department are positive.
As previously reported by Motorsport.com, the upgrade is believed to offer more power through detailed work on the turbocharger, including changes to both the number and angle of the impeller blades. Modifications have also been made to the combustion chamber and combined with a new Petronas fuel.
The revised package appears capable of producing more horsepower without increasing fuel consumption. Mercedes is also believed to have completed all the necessary interventions designed to improve reliability, a crucial consideration given the failures experienced during the first half of the season.
The German management side of the Mercedes organisation is pushing for the fifth engine to be introduced at Monza without further delay. Brackley and Brixworth operate under completely separate management structures, while the wider German operation is headed by Mercedes-Benz Group AG chairman and motorsport enthusiast Ola Källenius.
McLaren could also benefit from Mercedes upgrade
After the works team, Mercedes’ customer teams could also receive the upgraded engine, with McLaren standing to benefit in particular. Andrea Stella’s team returned to winning form in Hungary following the introduction of an update for the MCL40, with the changes helping to restore McLaren’s competitive performance.
Lando Norris and Oscar Piastri could take valuable points away from Ferrari, indirectly assisting Mercedes in the championship. The reigning world champion is 91 points behind Kimi Antonelli, but the Woking team does not yet consider itself out of the title fight. Lando Norris has maintained that belief after his Hungarian Grand Prix victory revived his championship challenge.
Formula 1’s return after the summer break will therefore provide several important storylines. Mercedes’ decision over when to introduce its upgraded engine, where Kimi Antonelli might accept a grid penalty and how quickly customer teams receive the new specification could all influence the direction of the 2026 season.
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