I am ZFG tuned with several other boltons and tonight at about 26,000 miles I switched to the one-step colder Ruthenium plugs. Is it possible that this thing is running “smoother”? I can’t describe it, but it drives and sounds a little different?!? I’m just confused that a set of plugs would do that at only 26,000 miles…
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Ruthenium’s?
- Thread starter TheBurlyMan
- Start date
