Alabama thread!

i changed mine when I started the turbo thing (right at the start since I check compression) I've also pulled them once since then just to look at them and close the gap a little since I'm running e85, I know for a fact I bought the truck with 142k on it and it had about 207k on it when I changed em and they looked pretty decent, and like I said, they had at least 65k on them and prolly a good bit more tbh

 

the cost doesn't really bother me even at 5$ per for NGK iridium ones.

I just hit the 150k mark and I myself have personally never changed the ones in this truck so that's at least 55k miles they've run lol

 

If it's not broke don't fix it

 

well but what constitutes "broke" for spark plugs?

 

too large of a gap

 

without pulling them I mean.

 

I don't think there is a way to know without pulling them. Pull one of the plugs on the passenger side. They are very easy to get to

 

it may idle like crap but other than that with out them being "slap wore out" I don't think you will notice much of a change, especially if you drive it often.

 

I plan to change at 20K, and make it by 25K.

And, it is time to change mine again.

 

The 4.0 (non S/C) prefers Denso copper plugs.

 

Really? Why's that?

 

Its what the manufacture recommends. And copper cores are every 30k miles.

 

@BamaTaco56 I'm now at 3.7 degrees caster and still no issues.

 

That's what they do round these parts

 

Functionally (electronic spark generation) copper is the best material to use, but wears (erodes). Platinum and iridium are added/used to slow down the erosion, but electrically are not as good as copper.

 

well thank you for the info, which denso's do you get?

 

Yessir .

 

Have you stuffed your tire all the way up though?