hmm, sounds like something that just happened to me...
I just got my 81 vanagon running for the first time in 5-7 years last
weekend (yay!) and had the same type of spray pattern.  I thought the oil
cooler was leaking, so I went ahead and went through the pains of pulling
the oil cooler. Once I pressure tested it, I didn't detect a leak... the
orings might be deceiving me because they didn't appear to be leaking. I
thought that maybe the fan might be blowing oil through the cooler somehow
if the oring/seal is bad, but I'm not sold on that theory as of yet.
Wouldn't the oil blow out both sides of the engine? Let me know what you
find when  you go to repair that leak. I'd like to know in case my theory is
bunk.

At the very least, I'll know the oil cooler seals and the fan hub seal/oring
has been replaced when I put my vanagon in full service....

Thanks,
Mark
http://www.veedubbin.com

'81 Vanagon
'78 Wesfalia
'71 Single Cab
'71 Deluxe
'67 Outlaw 912