So what is your favorite spark plug for your vintage motor? Are you buying for 'correct' appearance or performance? How many choices are available for you? With all the options and manufacturer claims these days, it can be hard to separate the wheat from the chaff... It used to be simple. In the '50s, Champion was the overwhelming choice for performance. In the '60s, Autolite came to the fore and nearly put Champion out of business; almost every race car you saw had an Autolite sticker on it. Unfortunately for Autolite, they had too much success; a anti-trust lawsuit was filed and the spark plug portion of the company was sold in '73 to Bendix (who also made Fram filters). Bendix let quality slip to the point that they were forced in the late '70s to offer a 'lifetime' warranty to lure customers back after working to bring quality back. But Autolite's imploding market share opened the door for other brands like NGK and Denso to name just a few. So what are you using, and why?