I recently switched to this grease from Amsoil.
Synthetic Heavy-Duty Grease, NLGI #2, GC/LB (GHD)
I was using Mobil 1 red grease, but didn't like how it ran out of the grease gun. I used it for many years w/o problems, but the Amsoil product seems better. Grease applications depend on how the vehicle is used. If it vehicle is used off road, in mud etc, follow Shannow's suggestion. In normal PC use, I grease mine 3 times/year.