The Truth About 10 Popular Spark Plug Brands

Choosing the right spark plug can make a bigger difference than you think.

From improving fuel efficiency to making your engine start smoother, this tiny car part plays a key role in your driving experience. But not all spark plugs are made equal—and some are better left in the shopping cart. Whether you're doing basic maintenance or trying to boost performance, here's a ranked list of the most talked-about spark plug brands, from the ones to skip to the ones professionals trust.