Can someone help me understand the numbering convention of auto plugs? I have a lightspeed and my engine came with Denso W24EMR-C plugs. The manual says "use only Denso plugs starting with a W or NGK plugs starting with a B in their designation." But there are many different part numbers of plugs that start with W (or B).
http://www.sparkplugs.co.uk/pages/technical/Denso-to-NGK-cross-ref.htm
What are the differences between these? How do I know which ones would be best for my engine?
http://www.sparkplugs.co.uk/pages/technical/Denso-to-NGK-cross-ref.htm
What are the differences between these? How do I know which ones would be best for my engine?