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RE: Bosch W7 DTC vs Bosch Platinum?
I feel that performance is better with the tri-electrode verions of any plug Vs the single-electrod version of the same plug, seem to work better longer too.
I use the W5DTC in the 85 ur-q because the '5' heat range is correct for the ur-q. The 5K/200 turbos use the '7' heat range, hence the W7DTCs in the big Qs. I fergit if the 5 or the 7 is hotter/colder......my guess is that the 5 is colder for less detonation at high boost.
I have not tried the Bosch platins in any Audi. I did try the Bosch platinums in some other cars (supajus) with bad results and have not experimented with them since.