threads

My 2016 Mazda 3 is at 71k miles, so I figured I'd replace the spark plugs. When I pulled them out, one looked like this: There was oil on the bottom threads but the top was clean. At first I thought valve cover gasket, but now I'm thinking the piston rings might be shot. The strange thing is...

just purchased a 2016.5 cx-5 gt with tech package.... I see there are some "CMU Hacks" that I can do... Very interested in knowing success/experiences related to executing these.... Might be a section/forum or threads related to this? thanks in advance

Would someone pleased delete the many spam threads below.

So many problems being posted about the infortainment center. Anybody having an ok time with their's? It's really deterring me from the tech package. :001_unsure:

Thought i would kind of bunch this up to make it easier for others. Will Rate the write up from 1-4 :) 4 being the best description/write up, 1 being not that great If you have more i might of over looked PM me or post it and ill put it in. And Thanks to all those who took the time to take...

I'd like to see a stickied thread for Bose and non-bose audio like the MZR performance parts list. For example the stickied thread with a parts list for the non Bose audio would include speakers, amps, subs, and other audio components folks have intstalled. Yes, there are more options for audio...