What does the air filter restriction indicator go by to determine when the filter should be replaced? A. Number of miles of vehi
cle travel B. Amount of restriction measured in inches of water C. Number of hours of engine operation D. Amount of light that can pass through the filter
The answer is the letter B. Amount of restriction measured in inches of water. <span>The restriction measuring devices are used to extend the filter's useful life, that is, they maximize the filter's useful life, which significantly reduces maintenance costs.</span>
