Got my 2011 CM All4 used with about 44k miles. I figured since I have trust issues when it comes to dealers ( I use to be a tech I know what goes on behind the scenes) Ill re-do all of the basic maintenance that is usually done at trade in to establish my maintenance time line and see what else could have been missed. Oil/ filter changed, Air filter changed, Brakes checked tires ok, then I pull the plugs..... Ill have to find a shop in OC area (I am thinking MiniWorxOC in Laguna Hills, CA) to rethread it.

forgot to add these two pictures

dang...it doesnt seem it damaged whole lot...i would find out who installed them in the first place?

I'd get new plugs and make sure that it grabs ok and has some thread sealer on it.