McLaren rocked up to Silverstone without the latest Mercedes power unit, while Alpine and Williams had already taken delivery. The official explanation from McLaren’s camp? Contradictory, depending on which team official you happened to ask.
CEO Zak Brown told assembled media there was no urgency: current units still had sufficient mileage remaining, and no request had been made. Then team principal Andrea Stella stepped up and confirmed McLaren had specifically asked HPP why they hadn’t received the new spec. Both versions cannot simultaneously be true.
The Technique Nobody Told McLaren About
The more revealing detail came from the telemetry. Stella noticed that both George Russell and Kimi Antonelli were lifting off the throttle just before the finish line during qualifying: a deliberate energy deployment tactic that McLaren had absolutely no idea existed.
“It surprised us somewhat, because it’s not something we had spoken about, and I’m not even sure whether that is available to us at this point.” – Andrea Stella
Mercedes is running operational modes that its customer teams are discovering from GPS overlays rather than team briefings. The FIA’s equal supply rule covers hardware. It says nothing about know-how, and that gap is rapidly becoming the most consequential performance variable in the sport.
Equal Parts, Unequal Performance
Technical Directive TD/005-18 states all power units from one manufacturer must be identical in all respects. But identical hardware with unequal operational intelligence does not deliver equal performance. Stella estimated McLaren is losing three to four tenths per lap simply from not extracting the full potential of the HPP unit. On a power-sensitive circuit like Silverstone, that is not a rounding error.
The ADUO debate has already exposed fault lines between engine suppliers and their customers, but the more insidious advantage runs deeper: built from years of calibration and development experience that no regulation can fully legislate away.
Belgium Is Now the Deadline
Lando Norris and Oscar Piastri should finally receive the updated specification at the Belgian Grand Prix. Stella framed it as primarily a reliability fix rather than a performance upgrade, though he made clear that deeper conversations with Brixworth are very much ongoing.
Mercedes lead the constructors’ championship with 333 points; McLaren sit third on 179, running ostensibly the same engine. Battery failures have already cost McLaren dear this season, and Stella’s carefully diplomatic praise of HPP’s ‘excellent relationship’ is starting to sound less like gratitude and more like a pointed reminder of a very large favour owed. In 2026, the engine advantage is no longer what is in the box. It is what you know about the box that your rival does not.
