I think that the recommended plug (and original equipment) is probably a Bosch Silver plug, and that is what I would probably stick to if I were you.
the car seems to run really good at the .028 with the bosch plugs
I've been researching spark plugs and i believe the oem's in Phaeton are Platinum. I am certainly going to verify that and will change mine to Iridium's. For the purpose of better power, performance, and fuel mileage.
I found a set that didnt get sent with my car for some reason when i sold it they are worth the money my idle smoothed out with the bosh compared to the autolite 63's
When it was time for my 80K service I used Bosch FR7HPP222 plugs gapped at .040. The current owner is now at 110K and the car is running great.
For the cars that call for the silvers as the OE plugs, there is no better choice [than the silvers].
They have 2 electrode and yttrium content with copper core. First, the car idle better now than with USED NGK 3 prong spark plug.The idle is lower at 800rpm(new spark plu gap) compared to 920 with NGK (bigger gap) The stock spark plugs were hafl used, white-black color but with some yellow tiny dots on electrode surface whats this ???? I went for a run and these spark plug are not made for high rpm use.. The engine noise is metallic above 4k and it doesnt pull like used but in shape NGK plugs. The spark plug gap is too small I think. I will check my mpg and report this later.
Don't use those, they suck. The center electrode is tiny, and fouls easily. I've had problems with them, and so have others. They don't last for ****.
everything else runs pretty poorly on our cars. especially the bosch +4's
I have bosh platnum on there and they look like crap after 2,000-3,000 miles.
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