I've been following this thread for a few weeks now, contemplating which spark plugs to use ("Parts store" Champion RE14MCC4 570 vs. Mopar Champion SPRE14MCC4 570).I have a 2007 Jeep Commander Limited due for its 100k service, which includes full spark plug swap-out.
I created this cheat-sheet to keep my my research in one place (note: green text indicates official OEM plug #, as per Mopar parts catalogue for each XK model year):
I then decided to purchase 1 Spark plug from the Parts Store (Lordco, here in BC Canada) and 1 from my local Chrysler Dealership so I could compare them. This is my result:
The spark plugs are completely identical in every way. The box, tip colour, "dot" next to the Champion name on the plug, all other markings on the plug, gap, the fine print on the spark plug boxes etc... are all 100% identical.
The only difference is I pay $3.49 vs. $5.80 (at the dealership) for the same plug.
It appears that the dealership is either selling me non-Mopar labelled plugs (which wouldn't surprise me) or, at least in my neck of the woods, the plugs are actually all the same no matter where you buy them.
For those who purchase plugs from the dealership, do the boxes/markings etc match up to what my experience was? i.e., anything differentiating about them?)
Unless anyone discovers something compelling in the next week or so, I'm going to pickup the remaining 14 Champion plugs that I still need to purchase, do the spark plug change, and see how my Commander runs.