Jet engines constantly pump oil under pressure between the stator and rotors to provide lubricant for the radial bearings while sealing and cleaning them. It’s a completely different kind of oil to the kind you’d find in a piston engine and operates at a much higher temperature.

Hybrid-electric propulsion systems can enhance flight endurance by separating propulsion and power generation tasks, individually optimizing each for specific stress levels aligned with mission requirements.

Hyllion Karno is a good example for power generation unit required ultra-low maintenance.