I have a set of the Beru Silverstone spark plugs (nology) and I am using the Ngk sport plug wires (Blues) and top of the Beru plugs came off in the plug wires. So I purchased the Ngk v power plugs and replaced the Beru plugs but I had to use two of the original OEM Sumitoma plug wires and noticed that the OEM wires had clean boots while the ngk plug wires had lots of black and brown dust on them as well as the Beru plugs. Then while installing the plug wires I noticed that the OEM wires were seating better to valve cover. I was wondering if the the lack of seal on the Ngk plug wires where contributing to the dust accumulation or if the dust was normal wear and tear, and if i should clean spark plug holes? Thanks

 

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