Are you sure it's oil and not some other fluid? Either way, send the 
lens in for servicing, don't try to clean it yourself.

Andy


At 01:13 PM 3/27/2009, you wrote:
>Can anyone come up with a plausible explanation as to how oil got 
>into the 10x objective on our LSM510 with an upright stand? 
>Yesterday someone complained about poor imaging through the 
>objective, and I discovered that there was a bubble of oil trapped 
>between internal elements. I'm at a loss as to how someone got oil 
>inside this low mag, non-immersion lens. Any ideas?
>
>Steve...
>--
>____________________________________________________________________________
>Steven E. Ruzin, Ph.D.
>Director, Biological Imaging Facility
>Curator, Golub Microscope Collection
>381 Koshland Hall               College of Natural Resources
>University of California        Berkeley CA 94720-3102
>510-642-6602                    510-642-4995 (fax)
>http://golubcollection.berkeley.edu
>http://microscopy.berkeley.edu

Andrew Resnick, Ph. D.
Instructor
Department of Physiology and Biophysics
Case Western Reserve University
216-368-6899 (V)
216-368-4223 (F)