Thanks for the advice, guys! I did a little investigating under the car yesterday. It's not the dipstick tube. The stain on the seem of the bell housing seems to start just below the dipstick tube. But, The connection to the is bone dry. I'll look around the filter housing. I did that gasket and the valve cover around the same time back in the fall. I do recall that I was racing the sun on the oil filter housing job. So, maybe something didn't get seated right. Is that possible?

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2004 X5 3.0 6 Speed MT
Build Date - 09/03
156K Alpine White / Black
Premium & Cold Weather Packs, Nav,
Tons of lighting mods, 4.8is Exhaust, Headers, Eibach Springs, OEM 87's, Custom DME Tune, OEM Hitch.

2005 X3 3.0i - 100K - Blue water Metallic / Black

2005 X5 3.0i - 140K - Alpine White / Hellbeige 2