McLaren Set to Debut Mercedes Power Unit Upgrade at Spa

McLaren will finally run Mercedes' revised power unit at the Belgian Grand Prix, with both Lando Norris and Oscar Piastri receiving the reliability-focused upgrade at Spa-Francorchamps. The team held off longer than fellow Mercedes customers because its existing engine pool still carried usable mileage, despite early-season battery failures that had already complicated its power unit allocation.

Why it matters:

Spa ranks among the most power-sensitive circuits on the Formula 1 calendar, so having the latest specification could prove pivotal. McLaren cannot afford another reliability setback after battery issues prevented both cars from starting the Chinese Grand Prix and resurfaced for Norris in Monaco, making this weekend's upgrade a vital part of its championship recovery.

The details:

• Lifecycle Timing: Chief executive Zak Brown rejected any suggestion that McLaren's delay stemmed from customer-team status, insisting the team simply needed to burn through the remaining life on its current units. Williams and Alpine moved to the new engine earlier only because their own schedules demanded fresh power units.
• Rear Wing Addition: McLaren will also trial a new rear wing assembly originally penciled in for Austria. The team will gather data during Friday practice before deciding whether to run it in the race, hoping to recover some of the performance missing at Silverstone.
• Realistic Targets: Technical director Neil Houldey stressed that Spa will still test the team's energy management limits and cautioned against expecting an instant leap in competitiveness.

What's next:

The Spa package is essentially a prelude to a larger development push earmarked for the Hungarian Grand Prix next week. That update should provide a clearer read on McLaren's longer-term trajectory as the squad continues honing concepts for its 2026 challenger.