The toxicity levels of engine oil and that of hydraulic fluids are a know without any doubt.
As for long term exposure to these contaminants such as Organophosphates, I would be qurious of the know effects to children of those exposed in the long term such as pilots. How many birth defects are there within people who work in an aircraft or engineers. Are the number of birth defects higher than say for average office worker and is there a link to long term exposure to solar radiation and fumes.