Changing plugs in my 2013 RT and shop manual calls for heat sink paste to be put on plug threads. So my local dealer has the paste, $38.99, enough to do 500 plugs. Have searched locally and no one carries it in small amounts. Radio Shack did but they have shut almost all stores. Question, is this paste really necessary and if so where can you get it locally. Probably on line but will be another week before I can get it going. Frustrated with this machine. Everything is difficult. TIA for any help.