I've had similar spark plugs fouling up issue with the G60 turbo swap in my caddy. After checking all the stuff you mentioned, I upgraded to an MSD Blaster 2 coil and NGK plugs with a wider gap (0.030). So far so good, running on all four cylinders now.
Reviews of spare parts for Volkswagen
Phaeton brake pads have a sensor attached that when pads have worn sufficiently thin, the sensor will wear through and provide the brake warning light to illuminate. The warning means that you need to replace the pads in the near future.
The top rated tire in this class was a Pirelli P Zero Nero All Season tire.
I just did the 4th oil change (first non-dealer change) on our 40k mile Tiguan TSI and used Rotella T6. I use it in my stage 2 WRX and think it's fantastic, so why not in the TSI. Great oil overall.
I just upgraded to a yellow top optima n I'm one cable short on finishing the big three.
No, your MKIII probably never came with a cabin air filter from the VW Factory. The MKIII Owner's Manual shows the cabin air filter, but it had to be an option that nobody took. Some people have retrofitted their MKIIIs with cabin air filter parts from MKIVs (part look exactly like the parts pictured in the MKIII Owner's Manual. Very simple upgrade, you just have to remove the right side cowl from under the hood, take off the two plastic nuts that hold the MKIII ventilation system plastic screen in place, replace with the MKIV filter base, place a filter on top, had secure the filter in place with the snap on plastic filter retainer/holder.
This. You can even just cut up a conventional air filter from target or something and throw it on there. Better than nothing. But the mk3.5 - mk4 ones are plug and play, and relatively cheap.
There should be a mesh screen on the passenger side of the car, under the raintray. Other than catching leaves, it's pretty worthless. I installed a mk4 cabin filter in mine. It's a direct swap and the filter catches any dust, pollen, etc.
Everyone swears the stock coils are great for 800hp because force fed did it. I don't care, the coils suck and always have. I always had random misfires here of there even when new, and I could never run the plug gap I run now with push downs or bolt downs on a stock car even without serious hesitation and enough to increment the misfire counter. This 190k mile Jetta did this also and I thought maybe carbon fouled plugs or a dying coil. Now it pulls 20 inches of vacuum with a rock solid needle at idle no bouncing, no hesitation. The car sounds absolutely different at idle, fresh plugs and a .040 gap, no other change but the coils and fersh plugs. It sounds throatier and crisper with the larger gap too.
Mobil-1 Multivehicle Semi Synthetic ATF: Notice a bit of a vibration in the brake pedal when the transission disengages (example: putting it in N while idling), or if it's shifting during a turn. Also I can smell ATF at times in the cabin and forward engine bay area, probably vapours coming through the top vent on the tranny casing. No leaks coming from the pan or bell housing though.
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