Most of us can't stay away from our plugs for more than a couple of oil changes. (gotta keep an eye on what the Bings are up to) A wise old BMW factory guy urged me to use Permetex antisieze if I planned to keep plugs in anything for long while. I use the famous BP6EV which is the single ground platinum version of the BP6ES, which crossed to the Bosch OEM. They last well, fire at a lower voltage and fit everything from my Honda mower to any old SAAB which happens by. (Oem on the old SAAB 8 valve) AS for the double ground plugs, I know they last but I believe they shroud the spark. Toyota OEMs dual ground from NGK or Denso in their lost spark systems, I use the NGK single platinum in my small fleet of Toys -- I think they run better and I get at least 50K out of them. (and there IS a cost saving)
AS we know, electric sparks jump best from a sharp point, which the EV's have.
Remember those BOSCH FOUR ground plugs??? "More ist besser nich whar?" Tried 'em once in a Saab. Went back to NKG.
There are some suggestions that the new bleep gas and the leaner mixtures of the post 80 airheads might require a (colder) 7 rather than a 6 heatrange. BP7s are available. I may have to try them, but running 93 oct probably avoids that -at some additional cost. My manual says 87.
