Nick
The Bosch plug that we have been using is "Bosch Platinum + 4" and the plug number is 4477. This too is not the recommended plug for the 2.1 WBX but it runs VERY WELL.
Larry

nickbellau wrote:

> I have had a set of Bosch super 4's (4 prong) W78's on my syncro for
> the past 40,000 km. They seemed to work well and I am now thinking of
> renewing them. I was wondering why the Bosch booklet at the Auto shop
> does not specify or recommend these plugs for the Syncro/Vanagon/
> Transporter/Caravelle.
> Any ideas ?
>
> Nick
>
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