What kind of grease is in the front suspension components with grease boots on original parts? I've always greased non zerk equipped front suspensions with a boot needle on the end of my grease gun to add lube to dry boots. Anybody else do this and what kind of grease are you using?

__________________
2004 X5 3.0 Auto 140k
2005 325xi Auto 108k
1988 325ix 5spd 279k