[moparisthebest]

I thought someone might be interested in this, I'm not sure if this is the right board to post in, but it seemed the best fit.

I just bought my wife a 2005 5.7 AWD with about 130,000 miles on it. It was purchased from the first owner who ordered the car brand new, and looks like he took very good care of it with routine oil changes and the like with one exception. When asked about the spark plugs, he said he never changed them. I bought it anyhow, did some research on what plugs to use, and went to replace them today. It's worth noting that the car didn't seem to run bad, one of my other cars is a 2007 SRT8 and it ran slower than that of course, but no misses or anything.

Anyhow, I pulled the plugs and they are 'worn' as expected. I checked the gap on a few of them and they all had about 0.065" of gap (0.020" more than the spec of 0.045"), I can't believe it ran at all!

I replaced them all with Champion Double Platinum plugs, and it runs EXCELLENT now, with the added grip of the front wheels I feel like it takes off from a stop slightly faster than even my SRT8.

Has anyone else ran plugs this long? I wouldn't recommend it.

 

[AFPVet]

Wow... on copper plugs? Sheez... even on the new platinum plugs, you want to change them at the 100k mark. That's astonishing.

 

[moparisthebest]

Yep, on the factory original copper plugs, they even had the Chrysler number RE****** on them.

Oh, it also might be worth mentioning that they were not 'frozen' or stuck in the block, despite people saying they need anti-seize (these specific plugs don't). I also didn't use anti-seize on the new ones.