Well done all of you.
Beru are very good plugs indeed and are prized amongst VWs originality fanatics as they were the OEM fit. I once had a slight bias towards Bosch plugs because their threads were rolled, not cut, and I believe that a rolled thread is less likely to cause trouble in alloy cylinder heads.
Alas, Bosch plug are now made in India and no longer have rolled threads.
Here's a story that might amuse.
Some years ago, when I was still trying to make VWs go much faster than their maker intended I built an engine that was on the out limits of the capacity capable of being contained in standard(ish) cases. The crank had sufficient additional stroke that some hours were required with a dremel to remove metal from the cases that would have otherwise prevented rotation. The cylinders were so large that the cylinder stud threads were all but exposed (and them constantly pulling out were one of the reasons I abandoned this engine as a bad joke eventually). In addition the barrel thickness as ultra thin so that they would fit in the maxed out holes in the crank-cases.
In short it was the sort of engine that gets built by an idiot (me), all 2.3lt of it.
Anyway it ran, but due to the thin barrel walls it had enormous blowby, which of course only got worse as heat and revs increased. In short it ate spark plugs at a prodigious rate through oil fouling.
And then I thought I found partial salvation. My local VW parts supplier had a great big tub of "Ring" sparkplus in his display area and at 30c each they were a bargain.
Made in the GDR, I'd never heard of them and I have never seen them since.
Looks deceive, they actually don't look too bad but no one of them lasted more than 15 minutes in my "monster" engine - I tried them in a stock standard engine and they started missing after about 30 minutes. In short they are the crappiest sparkplugs I have ever had any experience of.
30 years later and I still have 8 of the 24 I bought, I am still waiting for someone I really, really dislike to need BP6HS plugs!
