And as everyone has an opinion I do also, mine is Permatex 3H Aviation Gasket sealer. Use it on all my engine related fittings where I want to seal the threads, gas, oil or water, yet be able to get it apart down the line. No worry about getting anything in the gas, oil or water systems and pluging up a passage.
But as I said everyone has their favorite.
Denny Graham
Sandwich, IL