Red Bull and Toro Rosso have signed deals to run Renault Formula 1 engines for 2017 and 2018.
Both teams run the latest specification power unit and be free to badge it as they wish.
"We are delighted to extend our partnership which has proved very successful over time," said Red Bull team principal Christian Horner.
"After the reconstruction that Renault has undertaken, clear progress has been made which has made it logical to continue with the TAG Heuer-badged engine."
President of Renault Sport Racing Jerome Stoll added: "We are very pleased to partner with two such strong teams as Red Bull Racing and Scuderia Toro Rosso.
"Having competitive partners demonstrates the confidence both have in the improved Renault power unit and in our organisation as a whole."
Red Bull's renegotiated contract with Renault to run engines badged as TAG Heuer was due to expire at the end of this year.
However, Horner told Autosport on Friday he expected a renewal to be "a formality".
Toro Rosso swapped from Renault to Ferrari power this year but ran a 2015-spec engine and boss Franz Tost was keen for its next deal to be for current spec.
Red Bull has run Renault power since 2007, winning four drivers' and constructors' championships and 51 grands prix.
Toro Rosso had Renault power units for the 2014 and 2015 seasons.