Ross Brawn has warned Mercedes against extending its engine supply to deal to a fourth team for the 2011 F1 season.

According to reports in the French press, Mercedes bosses have already held meetings to discuss the possibility of supplying a fourth team next season, with the German manufacturer currently providing engines to McLaren and Force India as well as to its own team.

Red Bull have been linked with a switch to Mercedes engines but Brawn said it would be wise to give further consideration to any plans to supply a fourth team.

"In terms of engine deliveries, we are on the limit," he told Autosprint. "We should think long and hard before deciding to add another team to the customer list."

Brawn also denied that the Mercedes engine was the best on the grid, adding the different engines have different strengths and weaknesses.

"I do not know exactly where we are in that (horse power) area, but there are other things that come into play," he said. "You also have to consider the cooling, the fuel consumption and how an engine responds to the input of the driver.

"The boss of Renault's engine department said recently that it (the Renault V8) may be missing some engine power, but in other areas it is the best."

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