Ferrari has spent its second ADUO engine. The rulebook that sets what it cost never uses the word..
Article B8.2.2 of the 2026 Formula 1 Sporting Regulations gives each driver three internal combustion engines for a season, and Article B8.2.3 adds one more for the 2026 championship. Four, before anything costs anything. The Race reported on 31 August that Charles Leclerc and Lewis Hamilton had each used three engines and three turbochargers, and that Ferrari's second ADUO specification was built, unraced and waiting on a decision. Fred Vasseur answered the timing question on 2 September, and Ferrari confirmed the new specification for both cars at its home race. Sky Sports put the consequence plainly, that the two drivers "will be on their fourth engine of the season, the last before incurring any grid penalties". What outlives the decision is not the engine. It is what that fourth unit costs now that it has been spent.
Ferrari's permission to change specification at all comes from Appendix C5 of the Technical Regulations, under the Additional Development and Upgrade Opportunities mechanism the FIA settled on 26 August when it published its first ADUO rulings. Audi, Ferrari and Honda were each granted two additional homologations for 2026. Who qualified for them, and why Red Bull Ford's absence from the release locks it out, is a question about eligibility. This is a question about what a granted homologation is worth once it has been won, and the answer is set in a different book.
Two rulebooks that do not reference each other
Section B of the 2026 regulations, Issue 08, published on 5 August 2026, runs to 98 pages and never uses the word upgrade. Not in the element allocation articles, not in the penalty table, not in the homologation clause at B8.2.1, which requires only that a power unit conform to "the latest submitted and approved homologation dossier as defined in Appendix C5". The sporting rulebook knows that a dossier can change. It attaches no consequence to the change and offers no relief for it.
A new engine specification is a new engine, so introducing ADUO 2 means drawing a unit from the pool, and the pool is finite in a way the homologation is not. Ferrari's fourth engine is inside the allowance and costs nothing. Its fifth triggers Article B8.2.8 a., "the first time an additional element of each type is used: Ten (10) grid place penalty for the race", and every one after that draws five more under B8.2.8 b., cumulatively. Article B1.9.7 b. bars any appeal against a grid drop imposed under B8.2, so the tariff is the whole of the process.
Ferrari was not weighing a penalty against a performance gain, because on the fourth unit there is no penalty to weigh, and the upgrade rides in on an engine the drivers were going to need regardless. Timing was the whole of the question.
What Monza returned on the free engine
Monza answered on 6 September, at a weekend Ferrari had set the car up for on the straights, with the Hungary hanger flaps removed and a floor adaptation aimed at drag by The Race's account. Leclerc and Hamilton touched at the first chicane on the opening lap, Leclerc crashed at Parabolica on the second, and Hamilton finished sixth. Fred Vasseur's verdict on the hardware, given to formula1.com on 7 September, separated the step from the shortfall: "I think we did a step, but clearly we knew before the weekend that the fight in the race will be critical." The shortfall he named was the one the upgrade was meant to close. "Main issue was top speed and overtaking," he said, and "it was quite impossible for us to attack or to defend." Asked to go further he declined, "I don't want to give details," and then went further anyway: "At the end, we are missing pure power."
That is the free unit's return stated by the man who spent it. The specification that was meant to be worth most at Monza was introduced at Monza, and its team principal left Monza describing a car that could not defend on the straights. Formula 1's own account of the weekend adds a line Ferrari has not confirmed, that Leclerc's wrecked SF-26 left the team with "potentially some lost power unit elements". If any of those elements is the fourth internal combustion engine, the next one costs ten grid places under B8.2.8 a., and the decision this piece is about stops being a timing question.
Two clocks run against that decision and they are set by different documents. The allocation clock is the one above. The other belongs to the homologation, which Paddock Notes reported on 27 August must be introduced by the season's final race or forfeited, and The Race puts Ferrari on its second of two, the first having been introduced in Austria. A permission that expires and an allowance that runs out are not the same constraint, and a manufacturer can be caught by either.
A clause nobody can read straight
The four-engine figure that all of this rests on is not printed anywhere as a four. Article B8.2.2 says three. Article B8.2.3 grants "one additional unit of every element", and then lists the conditions under which it applies: "a. In the 2026 Championship b. If the Power Unit used is supplied by a PU Manufacturer who has not supplied Power Units in 2026 and is in its first year of supplying Power Units." No conjunction is printed between them. Read as cumulative the article contradicts itself, since a manufacturer cannot both supply power units in 2026 and not have supplied them. Read as alternatives it gives every driver a fourth engine this season, which is how The Race describes Ferrari's plan.
Appendix B5 of the same document supports the second reading, reprinting the pair for 2027 with condition (a) widened to "the 2026, 2027 and 2028 Championships" while (b) stands unchanged. That is a drafting question with the whole grid's engine allowance resting on it, sitting unresolved in the issue of the rulebook that governs the race.
What is not settled
Vasseur put it on the record on 2 September. "On the performance side, we are introducing an updated power unit as part of the development opportunities available under ADUO", he told RACER, calling it "a step in the right direction" in a year "very much about marginal gains". Crash had reported on 28 August, citing Italian media and Motorsport.com without naming a source, that Ferrari had decided, and The Race said three days later that it had not. The team statement settled it in Crash's favour within a further two days.
What Vasseur did not do, before the race or after it, is put a number on any of it. The circulating figures for what the specification is worth, a gain of about 15 horsepower and a new Shell fuel, still trace to the 28 August account as estimates. Ferrari quantified nothing beyond "marginal gains" on 2 September and nothing beyond "a step" on 7 September, and the second statement was made by a man who had just said he did not want to give details. The Race's account puts the Shell change with the first ADUO update at Austria rather than at Monza, and nothing said on either date resolves that.
Audi and Honda were granted the same two homologations Ferrari was, and their drivers are governed by the same B8.2.2 and the same B8.2.3. Each of them has an upgrade to spend, a finite number of units to spend it on, and a season that stops counting at the final race. The FIA wrote the permission into one rulebook and the price into another, and left the manufacturers to work out where the two meet.