Installed the NGK rs7 plugs and it runs fine. I kept them at factory gap, which was, if I remember correctly approximately .028.
I just hit 40k miles and went with the NGK (RS7) plug gapped to .024, and the RS3 coil pack upgrade. The initial results after install was underwhelming. Car ran a tad smoother, but that's it. Since the benefit of the RS3 packs were to provide a more intense spark, I tried a wider gap ~.028-.030 Man it woke things up! Revs "effortlessly" and pulls hard from top to bottom.
Bottom line: you can't go wrong with NGK. Can't really go wrong with OEM Bosch either but I'd just stick with NGK and make sure you gap them right, call it a day. I'd avoid Denso.
Change the spark plugs too while you are at it, with NGK BKR6EIX plugs (or BKR6E if you want to save money but these are the copper plugs and will not last as long as the iridium BKR6EIX).
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)
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.
I've been pulling my CR8EIX iridium plugs out to check how they are burning a lot recently. I've been seeing some light ash deposits and high speed glazing and the iridium tips of the plugs are not as hot as I would expect them to be, i.e., they are not *white*.
My car started experiencing misfires after changing the sparkplugs. Never happened before. Now it gives me a code for random misfires and #4 in particular. Today is the second tome it happened after starting the car on a cold morning. Second time 2 weeks after changing spark plugs. Just after I start, when its still cold, and never during driving or idling when warmed up. Strange. Could it be the plugs. I am using the new NGK ones. NGK Part # 1675 Laser Platinum pre gapped. Didnt have a problem with this before. I think these a are one range colder than the previous ones I had in the car. Could that be the problem?
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