The only claim the platinum plugs can make is that they *can* last for a very long time. That is a good thing on a car that gets a lot of mileage. On any car driven intermittantly, like most of us, who don't accumulate much in a year, the platinum plugs make no sense. They are also a lot more expensive. I am not against paying more but in this case you don't get more. Another point, Rob Grady, who pushed the platinum plugs early on, is seeing them fail. The seal at the shell and the porcelin fails and combustion pressure leaks out. He no longer recomends platinum plugs. If you change your plugs every 10 years or 25,000 miles you should be fine. (assuming 2,500 miles a year for 10 years=25,000 miles). The regular plugs will last just fine for that period. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "Harold McElraft" <hmcelraft@...> wrote: > > Actually - the HR6DS is a silver tip plug. The HR6DP is the platinum > tip plug, or at least it use to be. I used the Platinum plug for many > miles and went back to silver because I happen to have a bunch of them 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/ <*> 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/