I've used Mobil 28 on many helicopters over the last 35 years. Works well, lasts a long time. Having voted for my favorite grease I'm sure there will be many write-in choices from people who have strong opinions. My opinion is not backed by extensive research, just experience. I'm sure any general purpose grease that doesn't liquify at moderate temperatures would be fine if you apply often and liberally. IMHO, proper lubrication intervals are more important than what you use for the application points in our cars.