(Edit - David we posted at almost the same time, I started the post but then looked up the link attached below that is exactly what you brought up)

It's potentially nasty stuff in all scenarios - but especially nasty when heated and misted. It's a neurotoxin essentially. While you don't want it on your skin what you really don't want to do is breathe in oil vapor. What is oil vapor? My feeling is it is NOT just the smell of model turbine engines running on mixed fuel but rather a much higher dose of the oil that would be presented in full scale aircraft scenarios where you might, for example and among other examples, have an oil seal blow and oil smoke enter the cabin (and some other complicated cases of oil contamination) OR in MODEL AVIATION, if you are not careful and you do get a lot of skin contact... and also stand behind the exhaust and get direct warm air exhaust blast and oil residue on your skin all the time....

In other words, I suspect the threat is not one specific case of exposure (IN MODEL AVIATION) but more likely a long term case of small exposures due to careless handling, etc. Wear gloves when mixing and be careful. There is a plethora of documentation on the aeromedical effects of vaporized turbine oil done by some British pilot associations and also the Aussies. Most controlling agencies would like to pretend it's not a quantifiable risk factor in professional aviation but it is - and it also is in model jets.

http://www.aerotoxic.org/about-aerotoxic-syndrome