This is a pretty good article on spark plugs from the NGK site. http://www.ngksparkplugs.com/tech_support/spark_plugs/index.asp?mode=nml Bill B
This is a pretty good article on spark plugs from the NGK site.
http://www.ngksparkplugs.com/tech_support/spark_plugs/index.asp?mode=nml
Bill B