i ran them in my explorer 5.0 for about 10,000 miles, then they crapped out, so i put in autolite platinums, 30k and strong
Just a tid-bit of knowledge I picked up from tinkering with a late model GM...
Bosch is the only platinum plug that uses a pure platinum electrode.
The issue is that the others, (AC Delco problems is where I picked this up)
use only a platinum tip that is installed on the end of a standard electrode.
Usually, depending on manufacturer, they are a disc of platinum brazed to the electrode, ground strap, or one disc on each.
To the point:
The discs are KNOWN to fall off the tip of the plugs under "spirited" driving conditions. Leaving the plugs in a state of being non-platinum anymore, AND gapped slightly wider.
I am sure most know that when GM went to platinum tips, they listed spark plug change intervals at 100k miles.
Folks with "spirited" driving styles were burning plugs out in just a few k miles.
Anyway, they found the discs fall off after about 5k rpm... if not the first trip that high, soon after.
Point being that for folks that rev their engines, platinum tips are NOT the way to go. Bosch is the only one that won't come apart.
Either them or stick with standard plugs.
FWIW
Dave