> << I wonder why the quad tip is not specified by Bosch for the Vanagon;
> whereas
>  the tri-tip plug is??? >>
>
> Bill,
>
> Could it be because the quad tip came out way after 1991 when the last
> Bentley update for the Vanagon probably was?
>

Ben,
I'm only going on what I remember reading here on the list... but,
What I'm referring to above is the Bosch recommendation charts that come out
with every new product.... my understanding is that the Tri-Tip plug shows
up on the chart as recommended for the Waterboxer while the Quad-Tip does
not... to that end, if you go to buy plugs at Bus Depot... you plug in a 86
to 92 vanagon, for instance, and the Tri-Tip comes up for your van... the
Quad Tip does not....

All this could be an oversite on the part of Bosch... and perhaps Robert
Lily is correct... perhaps the Quad-Tip is better... I really don't know...

Bill