I finally got round to changing the spark plugs today. Found it fairly straight forward, the hardest part was getting the plenum covers back into position! (I took a fair few photos if anyone needs a rough guide.)
Anyway, most of them looked OK with a light grey, browny colour but this was the state of one of the plugs, any idea why it's like this? It was from the front right (think it's number 5 cylinder) so would be under the oil filler cap, could some spillage have got in their somehow?
BTW, car has done 50k and is 8 years old and I'm guessing they're the original plugs.
