Friend bought 8 of the NGK Ruthenium plugs and asked if I wanted the extra. I joked and asked did you think you got a V8? I bought four addtional and installed them today. I had the ring job done little before 120K and I am at 200K. I have been using the VMC Turner II for 80k and I think the plugs look ok? I did noticed some of the threads have some junk on them. I am guessing the spark plug tubes? Anything I should be worried about based on the plugs?