Well, after a 40 minute, first thing in the morning, spark plug service in my own driveway, I found that all but one OEM plug was nice and golden brown... The furthest front driver's side plug was a little blackened, lot less than the OP's though... I believe the OEM NGK's are scheduled in the maintenance schedule at 100k, and mine looked like they could've prob made that minus the one... My only recommendation is to use a double short locking extension due to the restrictive rear two plugs on both sides... Oh yeah, my wheel wells are mostly open since I just have rubber drapes inside them and did the entire swap through the wheel well since I am lifted... Saved me from having to climb up and into my engine bay... So, for those who are lifted, recommend you just pull your fender liners to easily access all spark plugs... 10mm socket, 5/8" spark plug puller, and two short extensions... start from front to rear and BOO-YAH! within an hour, you're done!