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"It may be positive for Formula One that they don't break the equilibrium, you know, between the teams," he said.
The case also exposed confusion in F1 about the rules that govern testing.
Mercedes said it asked veteran FIA executive Charlie Whiting, who oversees the running of F1 races, for permission to run its 2013 car in the Pirelli tests and that he gave his authorization.
But the FIA argued at the hearing that Whiting's opinion wasn't binding.
The FIA's tribunal, which it set up in 2010 for disciplinary cases such as this, largely absolved Mercedes, Pirelli and Whiting on this point.
"Both Pirelli and Mercedes disclosed to FIA at least the essence of what they intended to do in relation to the test and attempted to obtain permission for it; and Mercedes had no reason to believe that approval had not been given," the panel ruled.
It said Whiting also acted "in good faith and with the intention of assisting the parties and consistent with sporting fairness."
The FIA said in a statement it wants to tighten the rules to "make sure, in association with all F1 teams, that its control of the testings is strengthened."