changed out some spark plugs, shop here: http://autotech.com/passat/b6-3-6l-2006-2009/3-6l-vr6-ngk-spark-plug.html also I decided to get a new valve cover (comes with new gasket, bolts, bolt o-rings, and of course a new PCV oil separator that are prone to fail)
Just changed out the original plugs in my 2014 Ed30 GLi at 58K and totally agree with the other observations here. The idling has improved tremendously and the general over all performance of the car is back where it should be.
I used NGK Iridium.
I have a 12 GLI with 82k and just changed my plugs for the first time. Holy cow what a difference. It had been running a little rough and even made it seem like the clutch was slipping on hard acceleration between 3 and 4. I thought it was carbon buildup, but I just had that cleaned up at 60k. The new plugs make it run like new again.
I either use Delco or NGK. Never had a problem with either of them.
OEM plugs are good but NGK iridiums are just as good and cheaper. If your car is stock, which if memory served correctly it is, then use NGK BKR8EIX.
I just bought my old APR S3+ '03 Jetta back. It's been running these for 12 years. I seem to be fine w/ my AEBs and my BKR7e plugs.
Im stage 2+ running a .028 if i run any larger of a gap I get these weird misfires under wide open throttle. Kinda feels like the clutch slipping but its not.
i am using pfr7b. maybe coincidental but my 3000-6500 logs always run a few milliseconds faster. only problem with .028 are some few intermittent low rpm misfires.
I used the NGK plugs once and kept getting a pretty bad hiccup under hard acceleration.
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