I have been using the Champion RJ19LM plugs in my Craftsman Mover with a B&S 6.5PH Quantum Series Engine for a few years now. I just wanted to know if there was a noticeable quality and longevity difference between the NGK and champion plugs? I know when it comes to plugs for cars I would take NGK over Champ any day, but with copper plugs for small engines is there a big difference?
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