BTW folks McMaster Carr is now carrying teflon encapsulated silicone 
o-rings. Page 2865 in Catalog 105. 

The price is very good if the size fits. The 3/32" section 5 inch for the
large oil o-ring is not listed unfortunately. Neither is the 3/32 inch
for the small oil o-ring. Contact Greavy Seal Company directly
at (570) 587 4588  The web site is http://www.creavey.com
 
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