anyone know what causes a plug to be burnt at the start of the thread and goes up about 1/4 inch? i have two plugs that keep getting burnt,the electrode looks fine but the theads are burnt.cyclinder 2 and 4.[:@][:@][:@]

 

http://www.autozone.com/az/cds/en_us...rInfoPages.htm

 

none of those are showing what mine looks like.the tip looks just fine but looks like burnt oil on the threads,not carbon

 

imo it looks like oil around that plug of yours, its possible there is just some in the threads that may have gotten there by accident, or you could be leaking oil into the cylinder. But it doesnt looked fouled cus of oil.