Octane ratings are being discussed. Technician A says most modern engines are designed to use regular grade gasoline. Technician B says to use high octane gasoline only when an engine was designed to use it. Who is correct?

Question

Quizplus · Accepted Answer

Most modern engines are indeed designed to run on regular grade gasoline, which is what Technician A states. However, there are engines, particularly high-performance engines, that require or benefit from high octane gasoline to prevent knocking and to operate efficiently. Technician B's advice to use high octane gasoline only when an engine is designed for it is also correct, as using high octane fuel in an engine not designed for it offers no benefit and can be more expensive. Therefore, both technicians are correct.

Octane Ratings Are Being Discussed