Carlos Sainz is facing mileage restrictions at the 2026 Brazilian Grand Prix as Williams attempts to preserve his heavily used Mercedes power unit and avoid a potential grid penalty. The Spanish driver’s engine has already accumulated considerable mileage, prompting the team to limit its running at Interlagos amid concerns about Mercedes power unit reliability after extended use.
The restrictions also affected Luke Browning, who took over Carlos Sainz’s Williams for the opening free practice session in Brazil. The British youngster was given a severely reduced programme, completing just 12 laps before returning to the garage as the team prioritised protecting the engine.
Carlos Sainz confirms Williams engine mileage restrictions at Brazilian GP
Carlos Sainz himself clarified the situation, as reported by journalist Adam Cooper. The Spanish driver confirmed that he would face mileage limitations throughout the Brazilian Grand Prix weekend because his Mercedes power unit had already undergone extensive use.
Williams is attempting to avoid exceeding the engine’s remaining operational limits, while also seeking to prevent a grid penalty that could result from introducing an additional power unit. The team is also considering the financial implications, with the decision to preserve its existing engine potentially helping to avoid the expense of a replacement.
The situation reflects the delicate balance Williams must maintain between extracting performance from its car and managing the reliability of its Mercedes engine over the remaining races of the Formula 1 season.
Luke Browning limited to 12 laps as Williams protects Mercedes power unit
Williams consequently decided to prioritise engine preservation over gathering as much technical information as possible during FP1. Luke Browning’s 12-lap programme reduced the team’s opportunity to collect data and complete its planned preparation at Interlagos.
The decision could make the rest of the Brazilian Grand Prix weekend more challenging for Carlos Sainz, who must balance the need to maximise performance with the restrictions imposed on his power unit.
For now, Williams has not made a decision to replace the engine. Carlos Sainz will therefore have to approach the remaining sessions with one eye on lap times and the other on his engine’s accumulated mileage, as the team attempts to avoid unnecessary penalties and additional costs.
The situation adds another complication to Williams’ preparations for the São Paulo Grand Prix, where managing the available running could prove just as important as finding performance on track.
For the remaining sessions at Interlagos, see the 2026 Brazilian Grand Prix weekend schedule.
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