When I used 'em there was no performance or milage increase. They just
lasted forEVER.  As near as I could tell, whichever electrode had the
highest conductance got the spark.  When it wore to where another
electrode had more conductance, the other got the spark.  That increased
the effective life of the ground electrode by a factor of 3.  The center
electrode gradually changed from a circle to a rounded triangle.  As I
mentioned, that took a long time.

Ed

Jason Willenbrock wrote:

> hey all,
>
> what is the benefit, if any, of the bosch 3 electrode spark plugs for
> vanagons?  better fuel efficiency or what?  and how do you set the
> gap?  what should the gap be for a 90 vanagon?
>
> jason
>
> 90gl
>