Quote Originally Posted by Mirek View Post
Ferrari, Mercedes, McLaren, Alpine and Aston Martin are pure manufacturers and all the other teams use engines and other parts sourced from the manufacturers.

F1 is not a privateer series.
Only Ferrari, Mercedes and Alpine are full manufacturers teams in F1. Red Bull can also be considered as manufacturer team, although they buy engines from Honda (they are not Honda's factory team anymore as Honda did "quit" F1 (but not really)). All the other teams are buying parts from other manufacturers.

But I don't really understand what's your definition of privateers in this situation. Like they do build everything themselves? Or they buy everything possible from someone else?

In F1, the widely recognized definition of factory team is a team that build their own engines / engines are being built and developed exclusively for them.