Technician A says most engines use two oil control rings and one compression ring. Technician B says low-tension oil rings reduce friction and improve fuel economy. Who is correct?

Question

Quizplus · Accepted Answer

Technician B is correct because low-tension oil rings indeed reduce friction between the piston and the cylinder wall, which in turn improves fuel economy. Most engines typically use one oil control ring and two compression rings, not the other way around as Technician A suggests.

Technician a Says Most Engines Use Two Oil Control Rings