Single vs Double Platinum Spark Plugs: What's the Difference?
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If you're shopping for platinum spark plugs, you'll notice two types: single platinum and double platinum. They look similar and cost about the same — so what's the actual difference?
Single Platinum Spark Plugs
Single platinum plugs have a platinum disc welded to the center electrode. The ground electrode remains conventional. The platinum center electrode fires reliably for 60,000 miles and wears slower than copper.
Single platinum plugs work well in waste-spark ignition systems, where the plug fires on both the compression and exhaust strokes. These are common on older vehicles.
Double Platinum Spark Plugs
Double platinum adds a platinum pad to both the center AND the ground electrode. This matters most in distributor-based ignition systems that fire each plug in one direction only. With both electrodes protected, wear is even across the gap.
For distributor ignitions: use double platinum. For coil-on-plug (COP) systems: single platinum or iridium are typically preferred.
Which Should You Buy?
- Older vehicle with distributor: Double platinum for balanced wear
- Modern coil-on-plug engine: Single platinum or iridium
- High performance: Iridium for best results
Still unsure? Check your owner's manual or vehicle lookup tool. Browse spark plugs at Texan Supply with free shipping.