The Autolite 3923 Copper Spark Plug is guaranteed to deliver quick starts good fuel economy and smooth acceleration. Autolite Copper Core plugs are your industry standard. Autolite makes plugs for American Japanese European and Korean cars as well as plugs for Lawn & Garden and Power Sports. As a leading supplier of spark plugs the Autolite brand has the right ignition products for your application regardless of make or model import or domestic.