Kimi Antonelli will start the 2026 Italian Grand Prix from the back of the grid after Mercedes decided to install a fifth power unit on his W17 at Monza, but the championship leader will not receive an ADUO performance upgrade with the new engine. Mercedes has instead focused exclusively on reliability, accepting a major short-term penalty at Kimi Antonelli’s home race in an attempt to strengthen its position for the Formula 1 title fight.
Monza represents a particularly delicate stage of the season for Mercedes. The Brackley team arrives at the Italian Grand Prix in a strong position in both championships, but the Dutch GP demonstrated that the leading group is becoming increasingly compressed, with the competitive gaps between the top teams continuing to shrink.
Against that backdrop, Mercedes has chosen the Italian circuit as the venue to fit the fifth power unit of the season to Kimi Antonelli’s number 12 car, forcing the Italian to start from the back of the grid.
Kimi Antonelli gets new Mercedes engine at Monza without ADUO upgrade
The fresh power unit should naturally be more efficient than the older unit it replaces, but Kimi Antonelli will not benefit from any new performance developments. Mercedes has decided not to use its ADUO opportunity for this specification, instead concentrating the work entirely on reliability.
It is a significant decision that may also be viewed in the context of Mercedes potentially having limited room for manoeuvre under the budget cap. As previously reported by AutoRacer, the German manufacturer invested heavily in the first ADUO specification introduced in Austria and, even before then, in the development of the W17. The latter was no coincidence given the substantial advantage the car demonstrated over its rivals during the opening rounds of the season.
Mercedes has since faced increasing pressure as its competitors have closed the performance gap, with Toto Wolff acknowledging that the team has had to carefully manage its W17 development programme. The financial constraints surrounding that development race have also become a talking point, with Wolff previously discussing Mercedes’ budget limitations compared with Ferrari’s upgrade pace.
Toto Wolff puts championship ahead of sentiment at Antonelli’s home race
With Kimi Antonelli facing what promises to be a difficult home Grand Prix, Mercedes Team Principal Toto Wolff has made the team’s priorities clear.
“Kimi will take a power unit penalty and start from the back of the grid. It’s disappointing for him and for the fans who want to see him fighting at the front in his home race, but this sport doesn’t reward sentiment.”
From a championship perspective, Mercedes believes Monza is one of the most suitable circuits on which to accept the penalty because overtaking is comparatively straightforward. The long straights and powerful slipstream effect should at least give Kimi Antonelli opportunities to recover positions.
“When you make decisions that benefit the championship campaign, sometimes you have to pay a short-term price,” Toto Wolff explained.
The objective for Kimi Antonelli is therefore straightforward: “Recover as many places as possible and maximise the points.” With the Italian leading the 2026 Formula 1 Drivers’ Championship, Mercedes is prioritising the wider title campaign over the immediate sporting and emotional significance of his home Grand Prix.
Why Monza creates a major 2026 power unit challenge
Monza provides one of the most favourable environments on the calendar for attempting a recovery drive. The slipstream and extreme speeds increase overtaking opportunities, but the Italian circuit also presents a particular technical difficulty for the 2026 Formula 1 power units.
Toto Wolff highlighted the challenge of generating energy around the Autodromo Nazionale Monza, where drivers spend a large proportion of the lap demanding maximum output from the power unit while having relatively few opportunities to recharge the battery.
“Monza is an energy-poor track; you spend much of the lap asking everything from the power unit and don’t have many opportunities to charge the battery,” Toto Wolff explained. “With the current regulations, that creates compromises that will need to be managed carefully. It is an interesting challenge and one that will likely lead to an exciting weekend.”
Frederik Vesti explains Monza energy and slipstream challenge
Mercedes third driver Frederik Vesti also underlined the importance of energy management at the Italian Grand Prix.
“With its long straights and unique demands, Monza is very different to circuits like Zandvoort and Budapest, which are much more energy-rich,” Frederik Vesti said. “At Monza, energy management will be a key factor, so both the engineers and the drivers will need to be extremely efficient with the energy available.”
According to the Danish driver, the unusual demands of the circuit could also lead teams towards different strategic choices during the weekend.
Aerodynamically, the objective at Monza remains the same as ever: minimise drag as much as possible to maximise straight-line speed. “Teams will be working hard to achieve the lowest possible drag levels to maximise top speed on the straights,” Frederik Vesti explained.
That leaves Kimi Antonelli facing a difficult task from the rear of the field, although the characteristics of the circuit could help his recovery. “The slipstream effect creates overtaking opportunities, so there will be chances for him to fight his way forward.”
Mercedes warns mistakes now carry a much higher price
Ultimately, Mercedes is aware that it can no longer afford to leave points on the table. The Dutch Grand Prix demonstrated how fine the margins have become as Mercedes, McLaren and Ferrari increasingly converge at the front.
“The field has compressed to the point where several teams can win on merit,” Toto Wolff warned. “The price of a mistake is much higher.”
The Mercedes team principal nevertheless stressed that the Brackley squad remains well placed for the decisive phase of the season. “We have put ourselves in a strong position in both championships, but nobody in our team is under any illusion about how difficult the next races will be.”
