McLaren Making Regular Discoveries After Early Mercedes Power Unit Teething Troubles

McLaren is steadily unlocking the potential of its Mercedes power unit after a difficult start to the 2026 campaign, with team principal Andrea Stella explaining that the team has needed time to acquire the tools required to fully anticipate and optimize the unit's behavior. The defending constructors' champions have battled through early reliability issues to reach a point where they can finally study the power unit's sensitivities with greater precision.

Why it matters:

As a customer team, McLaren's ability to close the exploitation gap with the works Mercedes squad could prove decisive in the tight constructors' fight. Early setbacks, most notably a double Did Not Start in China where Lando Norris failed to leave the garage and Oscar Piastri was wheeled off the grid, exposed just how costly incomplete power unit understanding can be in Formula 1.

The details:

• Stella has been open about McLaren under-exploiting the Mercedes HPP unit compared to the factory team, a reality he attributes to the inherent challenges of being a customer rather than any lack of effort.
• The Chinese Grand Prix served as a painful low point, with both cars sidelined before the race due to power unit issues that highlighted gaps in the team's diagnostic capabilities.
• The Italian revealed that the team is finally developing the "required tools" to study how small parameter changes cascade into larger consequences, allowing them to anticipate problems rather than simply react.
• Throughout the process, Stella has maintained that collaboration with Mercedes HPP remains excellent, insisting that the under-exploitation gap cannot be closed without continued strong partnership.

What's next:

Stella estimates McLaren is still "a few races away" from a complete understanding of the power unit, but the recent progress offers hope for the second half of the campaign. If the team can translate these mid-season discoveries into consistent reliability and performance, it could yet close the gap to the works Mercedes squad and bolster its defense of the constructors' crown.