Red Bull motorsport boss Helmut Marko has vented another threat to quit Formula 1 if future engine regulation changes don't improve.
F1 sporting manager Ross Brawn is hard at working defining the sport's future technology path beyond 2020 when the currents set of rules expire.
But Red Bull is putting several conditions on the table, and if they are not enforced, the energy drinks company could leave Formula 1 altogether.
"The idea is very simple. We want an engine that is 1000hp, with a single standard KERS and battery, and development does not cost more than 15-20 million," Marko told El Confidencial.
"They should have sound, and allow the driver to make the difference. And independent companies like Ilmor and Cosworth should be able to enter so that we or McLaren can use them if we want," he said.
And if those conditions cannot be met, Marko confirmed that Red Bull might quit F1.
"Yes," he said, "because last year Mercedes would not give us an engine, neither would Ferrari, and Renault was only forced by Ecclestone to give us one.
"We want to have an equal situation where we are not blackmailed by a manufacturer," Marko added.