156,000 on my orig plugs miles, I think
 

Bought a 2010 CX-9 in mint condition with high miles from orig owner 3 mos ago. Service records on most items, but not plugs, so I pulled one to check. They are Motorcraft.
I replace the fronts 3 with NGK Iridium, will do the back 3 this weekend (what a pain) not looking forward to those back clips breaking as a front one did. Was running fin with old, big gap plug, getting 20.1 mpg. Preview attachment 20190602_124151.jpg




https://mail.google.com/mail/u/0?ui=...0-h120-df-p-nuhttps://ssl.gstatic.com/ui/v1/icons/...s/cleardot.gif
https://ssl.gstatic.com/docs/doclist..._image_x16.png
20190602_124151.jpg
3.9 MB