Questions about an engine SpaceX has been developing using Methane/LOX as fuel, which has a 2,200 kN (500,000 lbf) thrust range.

SpaceX is developing a new engine, using Methane and LOX, with a thrust of around 2,200 kN (500,000 lbf). The engine will be used in SpaceX's upcoming Starship rocket, in both lower and upper stage (with different nozzles).