The original spark plugs in the early years of the internal combustion engine were designed for low-speed and low-compression engines, and they had a life expectancy of well-under 1,000 miles.
Contrast with today’s premium plugs made with precious metals such as platinum, iridium or ruthenium. These plugs are routinely expected to last for 100,000 miles or more.
This video is sponsored by the Automotive Distribution Network.