Posted for "Jim Scales" <joscales98@hotmail.com>:

 I trap and dump oil and "stuff" from my separator.  I have seen the goop that
it collects.  I wouldn't think of returning it to my engine.  I drain it into
a cup in my hanger about every couple of flight hours.  Works fine for me.
 
 Jim Scales
 Angel's Playmate
 N98AF
 Lancair Super ES