Renault are the latest high-profile team threatening to quit Formula 1 unless proposals to adopt a 100 million dollar budget cap in 2010 are shelved.
Yesterday Ferrari joined Toyota and Red Bull in declaring their intention to pull out of F1 because of the plans.
And Renault boss Flavio Briatore says if the decisions are not revised, they have no choice but to withdraw from the world championship at the end of 2009.
Ferrari, meanwhile, say they will race in other series if they quit the sport.
Reports have speculated that the Italian team might set up a rival series, compete in the United States, or enter cars in the Le Mans 24 hour race.
The FIA, the sport's governing body, want an optional 100 million dollar budget cap in order to encourage new teams to enter.
The plan would allow capped teams to operate with far greater technical freedom than those continuing with unlimited budgets.
However, big teams fear the rules will effectively split F1 into two tiers, those that can live with the cap and enjoy the technical advantages and those that cannot.
It is understood a flexible rear wing alone, currently outlawed but available to a team next season working within the cap, could lead to a car being two seconds per lap quicker than those without.
