I use a home-made mix of one part sewing machine oil, four parts aircraft grease, five parts Molybdenum Disulphide powder. If I need it thinner, I add more oil, and it seeps into fine places quite well.
It's had interesting results, too--in the places where the thinner solution is used, the oil evaporates off at high temp, leaving a good coat of MoS2 that would have been difficult to get in there otherwise. The thicker solution stays primarily in grease form, with
fantastic lubricity and cushioning properties, and stays in place (except of course for the excess).
I've also had good results from using Ballistol, Mobil 1, and regular Hoppes (orange bottle), too, and lithium grease,
Shooter's Choice High-Tech, and axle grease.
The key is to neither over-do nor under-do it, and use each where it should go. The only reason I use a fancy home-brew mix is that I had the stuff laying around for about a year or so, and figured I'd put it to some use.