reading with interest the report that the crew had to be taken to hospital afterwards - how many people reading the report are aware of a SIL from bae that states after such an incident that crew have to have blood tests performed ASAP??
oil contamination of the packs can also be down to the apu, and smell is sometimes noted when changing over to apu air - simply because the apu air is hotter so will burn/vapourise any residual oil in the pack
regular pack burns can reduce the smells and is also suggested.