Red Bull team principal Christian Horner says Formula One's new deal to make engines cheaper and more standardised is "underwhelming" and "weak".
Horner said on Friday at the Spanish Grand Prix that it was a "shame" more could not be done between manufacturers and the FIA on the agreement for power units that will take effect at the beginning of next season.
Team bosses for Mercedes, Ferrari, and Renault said they were pleased with the deal that was confirmed by FIA before the Russian GP two weeks ago.
Force India team principal Robert Fernley didn't want to comment.
Mercedes chief Toto Wolff said that after "many months of hard work", it was "a good step forward".
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