Honda's success at the Brazilian Grand Prix has raised hopes that the Japanese manufacturer will remain in the sport and extend its current contract with Red Bull Racing and Toro Rosso.
Max Verstappen and Pierre Gasly finished in first and second place respectively at Interlagos using Honda engines.
Verstappen took his maiden career F1 pole in Hungary with Honda power, and followed that up with his second in Brazil. Prior to that, Verstappen won in Germany with Daniil Kvyat also on the podium,.
It's all a far cry from Honda's initial return to F1 in 2015 and its deeply disappointing three-year partnership with McLaren. Honda started supplying power units to Toro Rosso in 2018, and to Red Bull at the start of this year.
Honda's rapid rate of success in 2019 is thanks to dramatically improved speed and reliability. It has been well beyond expectations and may head-off the threat of Honda's management deciding to pull its plug on the whole F1 project.
"To take a third win this season is a great result for everyone at Honda and Aston Martin Red Bull Racing," said Honda F1 technical director Toyoharu Tanabe.
"The car-PU package worked very well with both our teams and that has to be a good sign for the final race of the season and when we look ahead to next year," he added.
Tanabe pointed out that the success in Brazil significantly came on the anniversary of the birth of the company's founder, Soichiro Honda. "I hope this result has a positive impact on our future."
Honda's chief engineer for Toro Rosso, Masamitsu Motohashi, was also delighted by the outcome of Sunday's race. "This is a great reward for all the hard work," he said.
"Really, I am lost for words. This is our second podium of the year with Toro Rosso, which is a wonderful achievement and it puts them in a very strong position to finish at least sixth in the Championship.
"We have worked with Pierre for the past two seasons now and so this is a great result in what was in some ways a difficult year for him.
"Our congratulations go to him and our friends at Toro Rosso and let’s not forget that Daniil also managed to finish in the points," he added. "This is a great boost for the team, but we must now aim to do even better next year.”
And now it looks like Red Bull and Honda are hoping to extend their relationship beyond the end of next season and into 2021 when new rules and regulations will overhaul the sport's sporting and technical landscape.
Dutch newspaper De Limburger reported that Red Bull motorsports consultant Dr Helmut Marko had flown direct from Brazil to Japan to take care of the final stages of detailed negotiations over a contract extension.
The report said that "sources in the paddock know that a deal to deliver engines in 2021 is also in the works," adding: "The Japanese would like to announce the news in Abu Dhabi, where the last race of the season will be held in two weeks."
Without a new agreement, Honda would almost certainly quit the sport at the end of next season - and significantly scale back its investment in research and development before that.
An extension of the collaboration [would be] especially good news for Red Bull Racing," reported the newspaper. "[But] an early announcement of a departure from Honda from Formula 1 would mean that Max Verstappen's title ambitions for 2020 are dead and buried.
"In that case, Honda would close the money tap and put the development on a low fire. For Verstappen it might also be the signal to move to another team in 2021. That threat is much less if Honda remains in Formula 1."
If Red Bull and Honda do extend their partnership, BBC pundit and former Renault driver Jolyon Palmer predicts that Red Bull and Honda could be serious title contenders as soon as 2020.
"If Red Bull can do what they've so far failed to do in the hybrid era - start the following season as competitive as they finish the last - then the Verstappen/Red Bull/Honda package could be a force to be reckoned with in 2020," Palmer wrote in his regular analysis for BBC Sport.
"For Honda in particular, [Brazil] was a moment that must have caused such joy," Palmer continued. "In truth, Honda were poor back in 2015. They took a lot of stick, but the unreliability and lack of performance were clear for all to see.
"Four years later, they are back with two drivers on the same podium," he added. "Just pure ecstatic emotion. A complete turnaround.
"Honda were dragged through the mud during the Alonso and McLaren years, but since teaming up with Toro Rosso last year, and now Red Bull in 2019, their performance improvements have been vast.
"Not only did Honda get a one-two, but they achieved the second place in the best manner possible for an engine manufacturer - a drag race to the line, against the formerly dominant Mercedes power.
"With the regulations staying stable for 2020, there should be every chance that Red Bull can challenge [for the title] over the course of [next] season."
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