The stock plug for the Pontiac is AC Delco (a GM subsidiary) platinum. They sell for $5+ at Kragen. The equivalent Bosch platinum sells for $2+ and has a 60 cent rebate. Does anyone have a feel for the relative quality of the two different brand plugs? Any reason I shouldn't use the Bosch?

And, get this. Called a dealer to find out how much they would charge to change the spark plugs (those back plugs look scary to do it myself). He quoted about $50 parts and labor for regular plugs and an additional $65 if platinum plugs are used. Deducting the cost of standard plugs, that's over $11 per plug at the dealer. I wonder what I misunderstood.

P.S. - I've always preferred AC spark plugs, and always avoid Champion brand since I had such bad luck with Champions back in the 1960's.

Regards, Gary in Sandy Eggo