I found the champion plugs you buy lately are crap. The one with black writing a I believe are a cheap imported. The older one with the red writing seems to hold Better. I pull all kinds of antique tractors, and the black writing ones are absolutely crap. I switched about 5 years ago to Autolite or Delco with better luck.
Might just be an idea but it also seems like the plated ones are easier to fool than the black one...
I hope ACDelco doesn't fall in the category of "cheap imported ones".
Today I purchased 6, genuine ACDelco spark plugs, R45S.
Listed on the box.....Made in China.
Looked at my other set of genuine ACDelco spark plugs, R43S...
Listed on the box.....Made in Mexico.
