Red Bull leads F1 engine table as ADUO stakes become clear

The FIA has delivered its first verdict under Formula 1’s new engine development system – and both the technological and financial implications are significant.

Red Bull Powertrains has been declared the benchmark power unit under the Additional Development and Upgrade Opportunities system, known as ADUO, following a review covering the first five races of the 2026 season.

The ruling, communicated to teams on the Louis Vuitton Monaco Grand Prix race day, determines which manufacturers are entitled to additional development opportunities and critically, additional spending outside the existing cost cap.

Despite dominating the start of the 2026 season, Mercedes has been judged more than 2 percent adrift of the Red Bull benchmark, entitling it to one upgrade homologation for 2026 and another for 2027.

Some reports also claim Mercedes will receive a $3 million cost cap relief allowance alongside an additional 70 hours of bench testing time as part of the ruling.

Ferrari, Audi and Honda have all been placed more than 4% behind the benchmark, entitling each to two upgrade homologations this season and two more next year.

The precise financial allowance for each manufacturer is understood to depend on where exactly they sit on the deficit scale – a figure known only to the FIA and the individual manufacturers.

Based on the published ADUO framework, manufacturers in the 4-6% bracket are reportedly entitled to $4.65 million in additional cost cap relief, rising to $6.35 million for those between 6-8% adrift.

Ferrari, Audi and Honda are therefore understood to be in line for a minimum of $4.65 million each, potentially significantly more.

The ADUO financial scale runs from $3 million for those 2-4% adrift up to $11 million for manufacturers more than 10% behind – with a further provision in 2026 only allowing those in the deepest bracket to bring forward up to $8 million of future cost cap allocation. The overall power unit cost cap stands at $215 million for 2026.

Technical analyst Craig Scarborough told Sector the delay in ADUO coming into effect was unlikely to prove decisive given the length of the season and Mercedes’ current dominance.

“Any delay in ADUO will have some effect, but in such a long season and with Mercedes having such an advantage, I don’t believe it has any real impact,” Scarborough said.

“You have to remember that this only affects the combustion engine, which provides only just slightly more than fifty percent of the outright power of the car.

“Probably more important than outright power is the duration of the high hybrid deployment, which is not covered by this process. Then, when you consider aspects like chassis and tyre performance in the overall car equation too.”

The ruling carries wider commercial implications beyond pure performance and Scarborough pointed to the indirect financial effects on teams further down the grid but does not expect customer teams to be caught out.

“Even though ADUO is cost cap relief, there could be a financial impact if it affects the competitive order – prize money in constructors and so on,” he said.

“Any updated power unit would need to be provided on equal terms between manufacturer and customer.

“In future years this may be different as the customers learn how to operate the power unit to its fullest extent – something some customers have struggled with at the start of this year.”

Scarborough identified Mercedes as the interesting case study. The Mercedes-AMG Petrnonas F1 Team leads the championship but has been judged as having the weakest combustion engine relative to its overall package – a function, he suggested, of deliberately holding performance in reserve.

“The main winner might be seen to be Mercedes, who so far have the best overall power unit, but their rating for their combustion engine means that they get one upgrade token,” Scarborough said.

“One wonders whether they have not run their combustion engine to its fullest extent in order to hide this performance advantage.”

Audi and Honda both receive two tokens, though Scarborough tempered expectations around their immediate impact – particularly for Honda’s sole customer – the Aston Martin Aramco F1 Team, which has so far endured a difficult year.

“Audi should look to bring dividends during the mid-season races,” he said.

“But in the context of a fight at the front of the grid, Honda’s additional resources not begin the full reversal of Honda’s and Aston Martin’s fortunes.”

Two further ADUO evaluation points are scheduled during the 2026 season, though grants are not cumulative within a single year – a manufacturer will only receive a financial allowance on the first occasion it qualifies.