ADUO Explained: The 2026 F1 Engine Rule Set to Define the Season
Summary
ADUO (Additional Development and Upgrade Opportunities) lets lagging power‑unit makers upgrade ICEs mid‑season. With Mercedes as early benchmark, the rule could reshuffle the 2026 pecking order.
ADUO (Additional Development and Upgrade Opportunities) lets power‑unit makers whose ICE falls at least 2 % behind the benchmark add mid‑season upgrades. The rule aims to keep the grid competitive as F1 moves to a 50‑50 ICE‑electric split.
Why it matters:
- Keeps the championship fight alive despite the new 50‑50 power split.
- Offers lagging teams—Aston Martin, others—a chance to close the gap to the early‑season Mercedes benchmark.
The details:
- FIA checks ICE performance at three points (after rounds 6, 12, 18) with a secret index; a gap of 2‑4 % earns one upgrade window, 4 %+ earns two.
- Upgrade slots open for the next race, but the calendar may shift after the early Middle‑East rounds were cancelled.
- Suppliers with multiple customers (Ferrari to Haas, Cadillac) must deliver the same upgraded spec, while all makers are already working on 2027 parts, so ADUO isn’t a free‑pass for laggards.
What's next:
- FIA will announce any threshold tweaks or calendar shifts before the Miami GP, setting the stage for the next ADUO window.
- Teams are lining up upgrade packages for the Canadian GP; Toto Wolff urges the FIA to apply ADUO transparently to avoid gamesmanship.
Original Article :https://www.skysports.com/f1/news/12433/13534807/aduo-in-f1-what-is-the-engine-r...