I'm ready to put the jugs back on motor after cleaning and inspection. I know the factory didn't use any sealant, but should I now? (High Temp RTV)?

hylomar or permatex 3h

Thanks. I'm assuming I put a thin coating on both sides of sealing ring?

I used Curil T. By sealing ring, I assume you mean the shim? I put the Curil T on both sides of the shim and on the jug. No issues to date.

.....Very minimal, if any?