MercedesMercedes-Benz, a brand of the Mercedes-Benz Group, has been involved in Formula One as both team owner and engine manufacturer... There's more... is a constructorIn formula 1 the Constructor is the team that enters the competition - a company, manufacturer or entity that designs,... There's more... and supply its own Power Units (PU). They also sell the PU to other teams – currently McLaren
McLaren Racing Limited is a British motor racing team, under the Marque of the Mclaren Group, based at the McLaren... There's more..., Williams
Williams Racing is one of Formula 1's longest-running and most successful teams. Founded in 1977 by Frank Williams and Patrick... There's more... and Aston Martin
Aston Martin's Grand Prix history can be traced back to 1922 at the French Grand Prix. From its debut, via... There's more....
The regulations state that the PUs supplied to other teams must be exactly the same as the ones they use. They must not gain an unfair advantage over their customers.
Find out more about Power Units – here