How good is Mercedes' 2026 engine? Sainz chose Williams because of it

In 2026 Formula One is implementing a set of revamped technical regulations which will see major changes in aerodynamics, chassis, with fuel and tyres also expected to be altered as well.

However, one of the most dramatic shifts will be seen in the power units, and this is an area in particular in which Mercedes have apparently excelled at going into next season.

During an interview with El Partidazo de COPE, Sainz spoke about the German team's engine. “Yes, I have a lot of confidence in the Mercedes engine.”

“It’s actually one of the main reasons I chose Williams for this new regulation change. I knew we’d be running the Mercedes power unit, and everything I’ve heard about it has been positive, and still is,” added Sainz referring to the paddock buzz that tips Mercedes as the leading force in terms of the engine.

Power is crucial, of course, but it isn't everything, and with Mercedes supplying engines to two other teams apart from Williams, Alpine and McLaren, success is anything but guaranteed, Sainz knows.

Sainz continued: “But of course, we can’t forget that Mercedes will have the Mercedes engine, McLaren will have it, Alpine will have it, and so will Williams.”

“So, no matter how good the engine is, you still need to get everything right with the chassis," added Sainz before concluding with a wink at his former team Ferrari.

According to Sainz Williams is a team on the rise. Following the Spaniard's first ever podium which he said had been the sweetest of his F1 career so far, Sainz highlighted the Grove-based team's surge in performance and culture.

However, last time out in Singapore, Sainz spoke about the team needing to improve still, to be able to maximise its chances across a race weekend.

The Spaniard didn't see only his team's area of opportunity, but he also sent a message to F1's production team about the broadcasts and how he felt were more focused on drivers' girlfriends and celebrities, causing them to miss key on track battles. Sainz' message has recently been answered to by F1 itself.

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