Autolite spark plugs receive high marks for cost, versatility, reliability and lifespan, according to Cars Direct. Autolite was given lower marks for optimizing engine efficiency. Although they are usually used in Fords and Chryslers, Autolite spark plugs are compatible with most makes of vehicle.
The Autolite XP3923 Iridium XP was ranked ninth overall in a top 10 spark plugs list compiled by eBay. This particular Autolite model was cited for its ability to substitute for more expensive manufacturer plugs and for the superior wear resistance of its iridium-plated electrode. The ribbed ceramic insulators on the Autolite were singled out as being particularly good at preventing misfires.