Toro Rosso's Brendon Hartley and Red Bull Racing's Daniel Ricciardo on track at the 2018 Monaco Grand Prix.

Red Bull Racing wants to choose Honda power for 2019 — but can Honda make it worth the team’s while?

Daniel Ricciardo on track at the 2018 Spanish Grand Prix.

Monaco will be a true test of Red Bull Racing’s claim to the sport’s leading chassis.

Valtteri Bottas testing in Barcelona

Has Mercedes got the title wrapped up already?

Honda's Masashi Yamamoto

Toro Rosso-Honda has proved surprisingly reliable compared to McLaren-Renault.

Daniel Ricciardo tests his Renault-powered Red Bull Racing RB14.

Red Bull Racing might have the car, but does it have the engine?

Renault's 2018 livery

F1’s three Renault-powered teams have an awful lot to prove this season.

Esteban Ocon on track during the 2017 Abu Dhabi Grand Prix.

The question of $12 million of prize money is still to be settled in the season-ending Abu Dhabi Grand Prix.

Jolyon Palmer speaks to reporters at the 2017 Japanese Grand Prix.

Jolyon Palmer will leave Renault on Monday in search for more accepting pastures in F1 or out.

Renault's 2017 F1 car, the RS17.

Renault’s hiring of Marcin Budkowski has angered rivals concerned about the privacy of its technical data.

Red Bull Racing principal Christian Horner, McLaren executive director Zak Brown, and Renault Sport managing director Cyril Abiteboul at the 2017 Singapore Grand Prix.

Red Bull Racing’s history with Renault suggests it probably isn’t.