mm wrote:

I thought I would just use what they sell for spark plugs in the auto
parts store. It's grey and creamy, and in the case of what they
pushed on me when I bought plugs, it was in a foil bag about the size
of a sugar bag at a coffee shop. Good to use?

Ideal.

Also screws going into aluminum get tightened to approx. 25 ft. lbs.