Thisis what Rob Grady had to say on this subject some time ago " Hello everyone, I wish to clarify David's remarks. When Bosch Platinum's came out in the mid-eighty's (I think? I must be getting old!) they were touted as the next great thing so naturally I tried them as a lower cost alternative to the tried and true "SILBERS" (check the spelling on the box!). What I found unfortunately was that almost a third of our subsequent tune-ups would return within a few hundred miles with an engine miss. We stopped using these plugs within a few months. If you want a cheaper plug than silvers the Bosch coppers fill the bill nicely. I haven't tried the Plus Fours yet but have a set waiting to throw in my green car. I'm just not that comfortable trying them based on my past experience. BTW I also don't recommend Bosch ignition wire sets as my "Daily driver" owners never seemed to get more than a year out of them. Stick with Bougicord wires, Bosch "Silber" or "Super" coppers, along with a Bosch cap and rotor and you'll have a combination that has ALMOST NEVER let us down over many hundreds of DeLorean tune-ups (Never say never:). Sincerely, Robert Grady " I agree with him and we fit only coppers because they're inexpensive, and they work. I had a bad experience with +4's Martin Mike Bosworth wrote: >Hi John > >Whilst i think the Bosch platinum spark plugs +4 are a good plug ( If >not a little pricey )....I personally like the stock Bosch ignition >coil and the 7mm Bougicord or Bosch spark plug wires, maybe even go >for the 8mm type with less resistance. > DOC UK Website: www.deloreans.co.uk Unsubscribe: doc-uk-unsubscribe@xxxxxxxxxxxxxxx ** Unless otherwise stated, all messages posted to the group are assumed public and may be printed in the club magazine ** Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/doc-uk/ <*> To unsubscribe from this group, send an email to: doc-uk-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/