These are/were Brisk LGS (Silver tipped) plugs I have had in my car for a little over 2 years now, they probably have about 50k miles on them. The tips were not bashed in or anything, but there is discoloration on them and a few have what appear oil marks on the threads, maybe you all can tell me?
The top set of plugs sitting on the box are from the rear bank in order from left to right, and the bottom half are from the front.
Any thoughts or input would be greatly appreciated.
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