Older Mercedes V8's (of which I have a few) call for copper NON-RESISTOR plugs (try and find 'em!) because the factory wire sets have built-in resistance...
Cars will run with BOSCH Platinum plugs but actually run better(IMHO) with copper resistor type plugs (often available within a $ per plug, + or - a $) but you must make sure you get the ones with the little screw off/on tips.
Certainly platinum plugs last longer in most applications when the heat range is correct. This becomes reasonable & readily apparent when plug accessability is factored in: plug replacement my SVX, for example, is a circa $300 job at the Stealer$hip because you had better know just how to get to them or you can spend a lot of time, scraped knuckles, etc. if you don't (I can swap out all 6 plugs in less than an hour, now).
Every 30K might seem like a lot of maintenance for those children raised on "100K plugs", "no need to change the tranny fluid" or, in some cases, not even be able to check it!
As far as the multiple electrodes are concerned...
REMEMBER the 1st razors with two blades? Try 5 blades, now!
(Can a 6 blade cartridge be far from release?)
////// = a REALLY smooth shave!
Cheers!