>Multiple electrode spark plugs do not create multiple sparks. The extra
>electrodes are there just in case the other ones fail. So in this case I
don't see the reason to pay extra for fancy spark plugs for our Vanagons
(content) when well maintained OEM plugs will do just the same. <<<SNIP

Yes... BUT

The un-shrouding of the spark and exposing it to the gas mixture has a
desirable effect on efficient combustion.     The Bosch +4 are better in
this aspect than our OEM plugs.

I personally noticed that my WBX runs more smoothly and more eagerly with
Bosch +4 as opposed to the OEM recommended plugs.

Chris.