Internal combustion engine

Romana II noted that Aoris had invented the internal combustion engine by Era 14. They used this technology to power their land vehicles. (AUDIO: The Paradox Planet)

Elsewhere, the people of Estebel were first shown the concept of the internal combustion engine by Prubert Gastridge. After its introduction, the inhabitants of the planet became more and more reliant on machines for everyday life. (PROSE: The Tomorrow Windows)

References

The Sixth Doctor said he found marsh minnows as a snack to be about as pleasant as eating an internal combustion engine. (PROSE: Mindwarp)