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RE: Bosch W7 DTC vs Bosch Platinum?
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.
Bosch uses higher numbers for "colder" plugs (with "colder" generally meaning
suitable for use in "hotter" engines...);
So I guess the factory specifies a hotter plug for the ur-q Vs the 5000/200TQ....?
That's the reverse of what I would have thought.