Renault issued its quit threat on Wednesday, following Ferrari on Tuesday and BMW, Red Bull and Toyota on the weekend of the Spanish grand prix.

But Mercedes, the majority owner of the 2008 drivers' championship winning team McLaren, is for now holding off -- perhaps because it recently narrowly escaped the wrath of the FIA over the 'lie-gate' affair.

Norbert Haug, vice-president in charge of Mercedes' motor sport programs, said: "All the teams agree that there cannot be a formula one with two different sets of regulations."

When asked specifically by the German news agency SID if Mercedes is also threatening to not enter the 2010 championship, he answered: "We want to achieve a common solution to this and we think that it can be done.

We will do everything we can to contribute," said Haug.

Haug also insisted that the quit threats, for example that of the legendary Italian team Ferrari, are serious and not mere political posturing.