First time....

[Robin Derrick]

So I just got my 02 Denali and I need to change her plugs. I have been reading and I see that they came factory with AC Delco Platinums, but that there was a service bulletin and that now iridiums are recommended. I want personal experience on the plugs. The truck will tow some, but not a whole lot. She will be used for mostly around town driving. Thoughts?

 

[Danny3737]

I ended up using the iridiums. I didn't notice any difference in feel or mileage. Both are good plugs and I doubt there is much lifespan difference between the two. The rear ones are a pain unless you remove the inner fender well and access them that way.

 

[Robin Derrick]

I ended up using the iridiums. I didn't notice any difference in feel or mileage. Both are good plugs and I doubt there is much lifespan difference between the two. The rear ones are a pain unless you remove the inner fender well and access them that way.

Ok great! Thanks!