McLaren drivers set to race with their last permitted power unit at Spa-Francorchamps

McLaren's Lando Norris and Oscar Piastri will compete at today's Belgian Grand Prix with fresh power unit components, which sees them exploit their maximum power unit allocation for the current season.

For the 12th year running, the 2025 F1 cars are powered by V6 hybrid turbo power units with 1.6-litre engines. This season represents the last year the current engine configuration appears before being replaced by a new power unit formula in 2026.

Current F1 power units feature seven elements: the internal combustion engine (ICE), motor generator unit-heat (MGU-H), motor generator unit-kinetic (MGU-K), turbocharger, energy store (ES), control electronics (CE) and exhaust.

Over the course of the 2024 season, a driver may use no more than four ICEs, MGU-Hs, MGU-Ks and turbochargers, two energy stores and control electronics, and eight of each of the four elements that make up a set of exhaust systems (comprising primaries left-hand side, primaries right-hand side, secondary LHS and secondary RHS).

For this weekend's Belgian Grand Prix, McLaren drivers Lando Norris and Oscar Piastri have received a fresh internal combustion engine, turbocharger, MGU-H, MGU-K while the Australian driver has also got a new energy store and control electronics.

Lance Stroll and Carlos Sainz have also received a new internal combustion engine, turbocharger, MGU-H, MGU-K , whilst Sauber installed a new control electronics into Gabriel Bortoleto's car.

All these changes mean that Norris, Piastri, Sainz, Stroll and Bortoleto have now exploited their entire allocation for the 2025 F1 season - in terms of the aforementioned components.