car is at 77000 miles stock what plugs to use

 

What's wrong with the ones you have in it already?
Chrysler says they are good for 100,000 miles.

 

A lady with a 2004 coupe was by the other day due to rough idle, wanted me to change her plugs.
The car had 150,000 + on the original plugs, I changed them, but the old plugs still look just fine, and were not the problem. The problem was the broken vacuum line to the heater controls.

 

Every 100,000 miles (161,000 km) or 5 years:
Replace spark plugs.

 

OR 5 years? Why does time matter with a spark plug? I have the originals in mine. I could see time being a factor on belts and such.

 

I assume rust/corrosion/buildup, but I really don't know. I just bought my 2004 6-7 weeks ago with only 5600 miles, and was told that they had a misfire type code and all plugs were replaced and it is fine.
Just that some people live by quoted specs, so I was ensuring the entire spec was quoted.
Personally, I go by, if it ain't broke, don't break it, and if it is broke, fix it, and drive more.

 

2nd law of thermodynamics, everything is in a constant rate of decline. Same goes for oil. xxxx miles or every 6 months. Personally I don't like plugs to be in for such a long time, 100k miles that is. had mine changed at 75k. Wires too.
If many mods, I.e. more boost is planned go a step colder on the plugs, wish I did but did not, I would think Rob would have caught that so I'm good.