Red Bull motorsport consultant Helmut Marko says the team could walk away from Formula One after 2020 if Formula One does not secure an independent engine supplier by the end of this year.
F1 recently agreed on cheaper and louder engines for 2021 onwards to replace the unpopular 1.6-litre V6 turbo hybrids introduced in 2014. The finer points will be discussed in the coming years but one of the points of agreement was to deliver more powerful engines while also making them simpler and less costly to develop and produce.
The agreement did not specifically mention an independent engine supply -- something which would give teams the chance to pick up an engine off the shelf if it could not reach without having to turn to one of F1's existing manufacturers.