Hello, I'm Danny.
If you want to apply a small amount of dielectric grease to help prevent corrosion that would be acceptable. You can use the grease on the main harness connector as well as where the spark plug boot connects to the coil pack. I've attached 2 pictures below of the dielectric grease to use and the coil pack where to grease. I've circled the spark plug boot location and circled in red. Hope this helps and thanks for using 2CarPros.
Images (Click to enlarge)
Friday, May 15th, 2020 AT 7:17 PM