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I know when I changed plugs on my 3.4 at 60K, I found that the dealer *forgot* to change them at 30K (don't use that dealer anymore).
hupptoy


Same thing happened to me! I had the 60k service done in case I sold the truck I'd have a record. At 95k it started missing badly which scared the bejeezes out of me. I decided to do the service myself and I found that the non-platinum plugs lookedg great but the platinums looked like hell because they had a 100k miles on them! Just goes to show you that if you want something done right you have to do it yourself.

BTW, is that 3 plugs platinum, 3 plugs non-platinum just a cost savings measure? Seems silly.