Starting in the 1980s, platinum-tipped spark plugs that lasted far longer than copper plugs came along (platinum is a much harder material). They also ran hotter, which reduced fouling.

Ordinary plugs need replacing every 30,000 miles, but platinum and iridium spark plugs could last up to 55,000 miles. If your vehicle has symptoms like hard starting and poor idling, it could mean ...

one reviewer pointed out that these copper plugs only last about half as long as their platinum or iridium counterparts. It’s highly recommended to replace spark plugs with the same brand the ...