Why you should do some jobs yourself
My previous sparkplug changes were done at dealer. It was time to replace them, and since I am retired I have twice the time and half the money, I chose to change myself. But when I started removing the first plug, I knew I was in trouble, plug was very hard to break loose then as I was unscrewing, it was tight and squeaking as I turned. There was not a trace of antisieze on threads of any of the plugs. I was lucky in that all were removed wlthout damage. So the new ones went in fine with proper addition of antisieze, and hopefully will remove easier next time.