Stella: Mercedes customer status put McLaren on the back foot

Andrea Stella said McLaren felt being a Mercedes customer put the team “on the back foot” in the 2026 Formula 1 season, blaming the customer-supplier arrangement for operational and integration limits that have compounded reliability problems. He said the new 2026 power units remain largely unknown and teams are still learning how to run them session by session. As a customer, McLaren has had fewer opportunities to align timelines with Mercedes High Performance Powertrains, to run joint experiments or to pair chassis tests with extended power-unit running in the way a works team can, Stella said, and that constrained McLaren’s development and response this season. The limits of that arrangement showed up across race weekends. McLaren, the defending world champion, produced a double-podium in Miami but then endured disrupted events in Montreal and Monaco. Lando Norris retired in Montreal with a gearbox failure after a strategic gamble on intermediate tyres, and he was forced to retire in Monaco with a power-unit problem. McLaren also recorded a rare double did-not-start in China and has faced a difficult opening stretch to the year. Stella accepted that some failures, including the Canadian gearbox issue, were McLaren’s responsibility. McLaren and Mercedes HPP are conducting a wide-ranging, ongoing review of individual items and broader factory-to-track processes to improve meetings, information sharing and reliability. Stella stressed Mercedes HPP was not deprioritising McLaren and said the relationship remains strong, but he warned that fixes will take time. McLaren’s leadership is also weighing strategic alternatives, with CEO Zak Brown saying the team could consider building its own power unit in future if it proved financially viable. The season marks the first time McLaren has publicly said its customer status produced these kinds of downsides.