Can you guys take a look at this plug and tell me what you think is on it? It came out a HD engine with 20,000 mi. Engine does not appear to have any modifications. It was supposedly a truck in a rollover accident and then totaled by insurance company.
This was in the #3 cyl. All other plugs do not have the deposit.

I think it is some type of additive from the fuel, but can't explain why it is only on one plug. Is this just some freak buildup or do supercharged engines see this more often?

One last thing...what are the best plugs to run in this stock HD engine?[IMG][/IMG] [IMG][/IMG] [IMG][/IMG]