I use them too. Work great. Only about 15K on them.

Bob Stevens
'87 Westy Syncro TIICO-ized (I-4)
"Passion Fruit"

I've used them in the old 1.9L, since that's what was called for in '85.
Forgot all about changing plugs for a while - when I finally did, they had
over 100,000 miles on them, and the center electrode was worn away to a
triangular nubbin, but the van was still running great!

Karl Wolz

  > TC
 > Sent: Monday, September 11, 2006 8:34 AM
 > To: vanagon@GERRY.VANAGON.COM
 > Subject: Anyone run tri-electrode Bosch W7DTC
 >
 > Funny did almost 25K since last year so along with front brake work
 > looks like its getting close to sparkplug time I just grabbed some W7CO
 > when i first got the van I was wondering if anybody has any feed back
 > on the W7DTC <3-pronged>