McLaren's Andrea Stella concedes their Mercedes customer engine status has become a disadvantage heading into the 2026 F1 regulations. Stella clarifies this isn't due to Mercedes HPP prioritizing its works team, but rather a lack of crucial integration opportunities. As a customer, McLaren has less ability to align development timelines, jointly address reliability concerns, or combine efforts for power unit exploitation and chassis experimentation.
Recent reliability issues, including Lando Norris's Monaco DNF due to a power unit problem, highlight this gap. While Stella acknowledges some reliability faults are purely McLaren's, like the Canada gearbox issue, the 2026 technical reset demands a new level of car-PU synergy. This has prompted a wide-ranging review of factory-to-factory collaboration with Mercedes HPP. Long-term, CEO Zak Brown remains open to McLaren developing its own power unit if economically viable. The challenge now is to bridge this integration gap before 2026 drastically alters the competitive landscape.
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