I decided to pull my plugs and change them after 12,000 miles and 2 years of being in there. They were Ngk tr-55's. The plugs looked amazing. No oil, no denotation, no dirt, no rust, no debri, they basically looked like a new plug that was in a car for 2 years. I was expecting them to look bad, but they were in great condition for a plug. They looked a hell of alot better than my stock platinums looked after 8,000 miles. But anyway, just thought I would share, I did replace them with another set of ngk tr-55's.
Josh
Josh