If you ever want to start a heated group discussion in a group of auto gear-head DIYers, simply ask what’s the best spark plug to use? As many opinions and reasons will start flying, as if you asked ...

Your engine’s spark plugs are one of its smallest and most important, parts. We look at some of the best. The engine in your car, truck, or crossover operates on the simple principle of capturing the ...

The many spark plug types are typically named after precious metals used in their center electrode, ground electrode, or both. Copper plugs are the most affordable and the most basic while iridium ...

The rate at which a spark plug wears out will vary depending on the make and model of the vehicle, the type of engine, driving conditions, and spark plug type. Engines with copper spark plugs ...

Spark plugs are a vital part of a gasoline-powered car’s engine. Without them the engine won’t start, and if they’re in rough shape the engine will run poorly. Nearly all gasoline-powered cars are ...

For hot rodders, spark plugs are often nothing more than inspection tools that reveal whether an engine is running too rich, too lean, or just right. Street guys look for a nice tannish-brown tint on ...