Mobil One Universal Synthetic is what it says one the tube, tub, or, whatever. Funny pink color, stable lube from -50 to 475 degrees F, or, some ridiculous number like that. Mr. Moody prefers Mobil 28, which, is aircraft rated, but, I think he just like the association with 28 gauge, in this case.
Either, is better lube then any gun was designed for.

Best,
Ted