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To get maximum life and performance out of a spark plug, it is necessary to improve the firing surfaces themselves. Metallurgical research showed that a high nickel-chromium alloy did a good job of resisting the forces trying to damage the plug.
In fact, the high nickel-chrome electrodes resisted heat and erosion enough that the better standard-grade spark plugs could maintain their gap settings for at least two years or 30,000 miles.
Consumers are always looking for something better, and that’s how double-platinum spark plugs have evolved.
Double platinum spark plugs have small platinum discs on the firing surfaces of both their center and side electrodes. The platinum does a superlative job of resisting erosion, so that the gap of the electrode stays virtually as set by the installer for as long as 100,000 miles. . .
The platinum firing surfaces don’t just
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