I had exactly this problem--oily diarrhea, more accurately, a considerable oily discharge from the rectum, no discernible bowle movement or cramping--saturday night/sunday morning after having a large serving of escolar thursday night. Thanks to everyone for the discussion of a rather personal issue! I was a trifle freaked out until I came across the various website discussions on escolar and butterfish. One confounding factor is that I also had a small serving of catfish on saturday night, but I eat catfish frequently and have never had any problem with it. No discomfort was associated with the oily discharge, leakage, whatever one would call it, in fact I had no idea it was happening until it became obvious

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I thought it might be useful to others to note that my first obvious symptoms were 36-48 hours after eating the escolar. So one needs to look farther back than what one has eaten in the past day--this may be relevant to lvandy, for example.