Formula One - Singapore Grand Prix 2017 - Practice - Singapore - September 15, 2017 Red Bull's Max Verstappen during practice REUTERS/Jeremy Lee
SINGAPORE (Reuters) - Renault and Red Bull have both described as "speculation" reports that they will be ending their engine partnership after next season.
The pair won four consecutive drivers’ and constructors’ titles together at the turn of the decade but the relationship has been fractious since a new 1.6 litre V6 turbo hybrid power unit was introduced in 2014.
