On the subject of thermal grease you are making sure that when you screw it down the whole metal base is making contact through a thin layer of grease. But not so much grease that a blob lifts one end up. They gave you the packet because it came with the electronic unit from wherever amd when they screwed it in the cheap distributor its quicker to use another tube of grease, and rather than throwing the sachet away they gave it to you.