The heat range of a spark plug is indicated by ______.
A) the color of the insulator ribs
B) the number of insulator ribs
C) a code within the plug number imprinted on the side of the spark plug
D) all answers are correct

Question

Quizplus · Accepted Answer

The heat range of a spark plug is typically indicated by a code within the plug number imprinted on the side of the spark plug. This code helps identify the plug's ability to dissipate heat.

The Heat Range of a Spark Plug Is Indicated by ______