Plug change interval is the same, no matter what type you use. 30K isn't necessary, but no more than 50K

 

I remove the rubber in my sockets because I have had too many issues with the rubber holding to socket on the plug after installed way down in the head and the extension slips out and there is no way to remove the socket.
That's just the kind of luck I have, so I went with the rubber hose to drop the plug down in the head and start the threads.

 

If Warranty is an issue yes you are best to stay within the mfg's plug change interval which is 30K. If the change interval concerns you warranty wise then you should only run copper plugs as well. However, the OP doesn't seem to care about warranty and has discussed other plug types so I talked about Iridiums and their benefits. If you have no warranty concerns out in the real world Iridium plugs are good to 100K. Changing an Iridium plug at just 50K in a healthy engine is a waste of that plug. That is like using top of the line synthetic oil and changing it every 3K. You are only using a small part of the service life.

The OP has a 2005 so warranty should not be an issue unless it still has a 7/70 PTW and is under the 70K. There is no reason other than warranty technicalities to change an Iridium plug before 100K in a healthy engine. GM uses them and has 100-125K intervals and even Dodge is begining to use them and recommend 100K in some applications( 08+ 4.7L lower row = Iridiums w/ 102K interval ).

 

I'm confused by this. I replaced the identical plugs that came factory with my truck. That being Champion copper cores. My speedometer said 93,000 km., or converted works out to be about 55,000 miles. The truck worked fine prior to changing them, and the only reason why I did, was because 90k. is the interval that my Dodge dealership (and which I'm assuming Dodge), suggested changing them at.

What am I missing here?

 

What engine? What year?

The 3.7L, 07 and earlier 4.7L, and 5.7L engines all have a 30K( miles )plug change interval. That is what Dodge says. The 08+ 4.7L has a different setup. The top row of 8 plugs have a 30K( miles )change interval and use standard plugs while the bottom row of 8 plugs use Iridium plugs and have a 102K( miles )change interval.

Look in your owner's manual under maintenance. It is right there. Many dealers make things up.

 

I have a '06 Ram Hemi Sport, and yes, that's what the dealership told me. I will check what my manual says. I just took what the dealership said for being accurate. All 16 plugs that I took out where identical though - that being copper cores.

 

All 16 plugs in the Hemi are the same. Copper core has the best spark which is why Chrysler uses them to burn all of the fuel possible for emission reasons. They will go 40 to 50K without too much problem. I'm doing the recommended 30K on mine due to the lifetime powertrain warranty just to be safe.

 

all i use is champion stock plugs, have never had an issue with them...have pushed em pretty far too. iv heard of and seen a few guys getting a ton of misfires and throwing codes for trying out different plugs. the hemi is a picky girl.