If you have a stock engine (excludes turbos and other mods that would change internal characteristics except exhaust - that probably doesn't change much), the only "choice" I can think of in spark plugs is the brand. Which ever plug you pick it should cross reference with the OEM Bosch HR6DS. Anything else, in my opinion, is asking for trouble. The "S" refers to a silver based tip, "P" is platinum, and "C" is copper. I have had good luck with either Silver or Platinum - Silver is my personal preference. My last tune-up I went for DMCH's NOLOGY kit. It has silver plugs similar to the OEM but the wires and amp are supposed to kick up the spark punch, etc. The real benefit I noticed with the NOLOGY is more punch at the 4-6,000 rpm range. My car is an auto and the quicker high-end revs make it more fun to drive. The "6" plug is a good mid range operating temp plug - you should not stray from that unless you are into serious mods, etc. and/or know what to look for in changing the plug operating temp range. Harold McElraft - 3354 --- In dmcnews@xxxxxxxxxxxxxxx, "T. Madsen" <fishheadlouie@...> wrote: > > Help fellow De Lorean owners. > > I am having trouble choosing spark plugs. I got 32 of them off ebay the other week advertised for the De Lorean, but sure if they will work. They are NOS AC R42LTS made by AC Rochester Division General Motors Corportation, Flint Michigan 48556. > > http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll? ViewItem&ih=013&sspagename=STRK%3AMEWA% 3AIT&viewitem=&item=230176053855&rd=1 > > My original manual suggests using Bosch Platnium tipped HR6 DS (Platnium tipped) plugs. > > Walmart sells a variety of Bosch 4301/4304, etc. and Autolite plugs AP w/ various #s using Platnium. > > At what intervals should i replace the plugs, once i find the kind to use. > > Also, manual calls for DOT 4 brake fluid; will DOT 3 work--label says it will work on disc brakes systems. > > any suggestions on type to use plugs/fluid? > > many thanks > > Tony #5470 > > > --------------------------------- > Moody friends. Drama queens. Your life? Nope! - their life, your story. > Play Sims Stories at Yahoo! Games. > > [Non-text portions of this message have been removed] > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/