All correct Chunky monkey.
The next bit you need to understand is that anybody breathing the oil fumes is being exposed to organophosphates (work related).
Here is MS 17 a UK HSE (Health & Safety Executive) document from 2000, which graphically explains the medical effects on any exposed human beings.
Sadly this document is no longer avaialble from the Government sources - I wonder why?
http://www.aerotoxic.org/download/do...dence/MS17.pdf
If only MS 17 were to be reissued to doctors, they might begin to understand the mysterious illnesses they witness every day, but can't work out what is causing the range of symptoms....