BMW has called a press conference for this morning amid speculation that it will become the second manufacturer to quit F1.
The emergency press conference has been called citing 'current developments in motor sport', with the announcement expected to come that the German marque will follow Honda out of the sport.
The team battled hard for the title last season with Robert Kubica, but has endured a miserable season in 2009 and failed to build on the promise shown in 2008.
F1 chief Bernie Ecclestone did little to play down the rumours on Wednesday morning, telling the BBC
that BMW's hopes of winning a world title within three years – a target they have failed to achieve – could be partly behind the decision.
"It's not quite been like that so perhaps that's why they've [decided] to stop," said. "When you consider how much money they've spent and the results they've got, it's probably not such a good investment.
"They were quite sure that they were going to win the championship within three years, and I was hoping they would."