So far the Autolites have been doing fine.

 

i swapped the orignial plugs out today on my 2010 hhr 2.2L. easy process if it wasn't for that STUPID airbox design. that thing is a PITA. once that PITA thing is removed its quite simple, one of my plugs had oil on threads, so my Valve cover gasket is shot. not burning oil, or any other issues. good thing i changed them at 71k. sometimes u will discover other issues when doing routine maintenance. FYI plugs are supposed to be good for 100K miles, but i will never leave mine in that long. too hard to change after being in there that long.