I have just replaced the oil and all 6 spark plugs with Bosch Double iridium.
As for the spark plugs, both Bosch Iridium and NGK Laser Iridiums are fine, arguably even better than OEM (which are made by Denso, btw).
I have a stack of 25+ index cards filled with notes about the care and service of the car. The factory service manual has notes and highlighted areas all over it.
Replaced spark plugs with genuine VW Bosch units
Belated follow up. I replaced the plug at the distributer as the signal from the hall sender was intermittent. Brand new Bosch plugs were had for cheap.
So I grab a new ignition coil, and a full set (4) of spark plugs. The Pre-gapped BOSCH Iridium plugs were the same price as OEM platinum, so I figured that's fine for me.
After pulling the plugs, Cylinder 1 plug was definitely eroded. The other 3 plugs looked fine, but I might as well replace the lot. The new Ignition Coil went into Cylinder 1 as well, and I started it up.
Check engine light went off, starts up fine, drives fine, idles fine.
i changed the original NGK spark plug with new Bosch super 4 spark plugs. a nice improvement but still far from old good performance.
Lesson learned: DO NOT EVER EVER EVER USE BOSCH PLATINUM (STANDARD TIP) SPARK PLUGS IN YOUR VR6 ENGINE.... THEY JUST DON'T WORK!
If you use anything but OEM plugs in a stock white block, well just don't do that. Also Bosch Platinum, great for having to pull your head and find out what the center of the plug did to your engine
For the OEM Bosch plugs, I would check them every 10k-15k miles at a minimum, based on what my stock plugs looked like @ 19k miles (sh!t).
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