:lolup:that's got to be the most tenuous link you could have, you might as well say that they all had tyres on so it was the fact that they had tyres on caused problems with the plugs
Slightly less tenuous as you make out given they're all (IIRC) one make and model of spark plug & other people in those threads saying they've heard bad things about the same plug.
However of course I'm not saying anything non-OEM blows up - as you'd be right in thinking that does sound ludicrous.
But like it or not these cars do seem to be fussy about the type of plug, same as they're fussy about timing, same as dephasers are fussy about regular oil changes changes, same as they're fussy about non OEM rear bearings.
If you look at a forum every week for a few years you do notice the threads that crop up over and over again. Spark plugs are one of those threads.