Spark Plugs, Interesting Observation
I had a misfire problem not long ago on my '97 Deville and the first step was to replace the plugs. At 92K all the platinum tips were gone. Well, my wifes '96 Bonneville 3800 series II (N/A) was running rough and at 112K I figured it was time. The manual calls for 41-601'*, but I found platinum tipped 41-921'* in there. When I bought the new plugs they (A/C Delco, dealer & parts stores) now call for 41-101 "Iridium" (I don't know what the difference between platinum and iridium is), which is what I bought. Interestingly enough, unlike the Northstar, when I pulled the plugs, all the platinum tips where there. In hind site all I needed to do was clean, regap and reinstall them and I'm sure they would ahve been good for another 100K. They were in such good shape I did, clean, regap and saved them, "just incase". Comments?
One other interesting note. I noticed that the A/C Delco box said "Made in Japan" :o