Shouldn't really matter as long as it is high temp. As Matt said above, make sure that you remove all traces of existing grease. I would soak them in engine degreaser overnight, it should dissolve all of the gunk in there. Then repack and you'll be fine.

__________________
TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth