I’ve never had this issue before but I noticed the metal on these plugs are 2 different color shades. The part numbers and material are the same. Anyone have any input?

 

Where did you get them from? Could just be age. If you got on amazon you might worry about fake plugs, but chances are it is just age.

 

Thanks for the reply. I had to get them from 2 different auto parts stores because neither one had enough in stock. I’m thinking probably because they came from two different batches. No issues after installation. They’ll all be the same color in a couple months.