Changing front CV outer boot. Went to smack off the outer shaft/bearing retainer from the main shaft, and the entire main shaft w/inner triple roller and inner boot came out. Whereas the outer CV joint contains what looks like a grease, the inner looks brown and more like a heavy weight oil. It can't be diff fluid, and the inner boot isn't torn, so no water could have gotten in.

Anyone explain that?

__________________
2005 BMW X5 4.8is