Red Bull owner Dietrich Mateschitz says he needs to finalise a power unit deal by the end of October or will quit F1.
Mateschitz has been threatening to leave the sport as he seeks a competitive power unit having ended Red Bull's partnership with Renault. Mercedes turned down the opportunity to supply Red Bull, with the team now in talks with Ferrari.
With the situation dragging on and the team keen to finalise its plans for its 2016 car should it remain in the sport, Mateschitz says he needs to complete any deal within the next four weeks.
"We strive to get motors, but we get none - at least not the one we want," Mateschitz told Speedweek magazine. "The prerequisite for moving on is competitive engines."
Asked for a deadline to finalise a power unit deal, Mateschitz replied: "Sometime in late October."
Christian Horner recently described Red Bull and Toro Rosso as being in a "critical situation" regarding power unit supply.
Chris Medland's Russian Grand Prix preview
Red Bull: Burning bridges everywhere
F1i technical expert Nicolas Carpentiers takes us through exclusive pictures of Renault's power unit
Keep up to date with all the F1 news via Facebook and Twitter
Carlos Sainz insists Pirelli still has considerable work to do on its intermediate tyre which…
Ferrari team boss Fred Vasseur admits to feeling relieved after his sit-down in Brazil with…
On this day in 1994, Michael Schumacher clinched at the season finale Australian Grand Prix…
Red Bull's Isack Hadjar is not quite ready to call time on his 2026 campaign.…
Aston Martin F1 team owner Lawrence Stroll is reportedly “at wit’s end”, according to Sky…
Toto Wolff has no intention of rewriting Mercedes’ recent history now that the team is…