slightly O/T but I think these days with all bosch plus made in india they
quality is really lacking
over on the samba lost of good reports  with going to the NGK BP6ET 3 prong
made in japan
http://www.thesamba.com/vw/forum/viewtopic.php?t=327351
http://www.thesamba.com/vw/forum/viewtopic.php?t=335387

All I can say was got some from bosch W7CC busdepot jan 08 and around
nov-dec 08
I had this really odd running condition while cold it would just die
randomly when I was at idling at stop lights
every check out temp sensors, dist cap, wiring etc so I saw the most on the
ngk
put em in & this issue went away the made in india plugs were a bit pitted
but nice & brown & on road trip it ran ok
and I'd may put 8K on em, no smoking gun just saying & other anecdotal
evidence from random post seem to say
bosch plugs aint what they used to be :(

--------------------------------------------------
From: "Michael Tevis" <michaeltevis@HOTMAIL.COM>
Sent: Tuesday, April 07, 2009 3:23 PM
To: <vanagon@GERRY.VANAGON.COM>
Subject: spark plugs

> I'm doing a tuneup on an 85 1.9L engine that had about as much power as
> any
> 2.1L i've driven. it's a 1.9L case but might have bigger pistons or
> something. anyway, i took the plugs out and they are Bosch W8DC. most
> vendors sell the W7CC or WR7CC. bus-boys.com shows a W7DTC for the 85
> only.
> No other 85 I've worked on has had any bosch plug other than a W7CC. does
> anyone know why bus-boys and the previous owner of this 85 feel that the
> 85's need the W_D_ _ plugs that have a less shielded spark thats also a
> little further into the cylinder? the threads arent longer, just how far
> the
> electrodes are from the threads.
>
> www.boschautoparts.com/NR/rdonlyres/C77B3446-232B-4AEC-AFA9-AD05F2A0A2AD/0/DesignationCodes.pdf