Originally Posted by mtthmpsn

I replaced my valve cover gasket yesterday and went ahead and replaced my spark plugs as well. Even though the car ('06 3.0i, 219k miles) was running fine, it'd been about 75k miles since I replaced them.

Couldn't believe what I saw. That's like a 2mm gap (NGK Iridium). All the spark plugs looked like this. Can't believe it wasn't misfiring. Anyhow, thought I'd share and am looking forward to seeing if replacement improves my MPG going forward (TBD).