I know at my previous carrier, the dirty sock smell was nothing out of the ordinary. You'd come across it regularly (at least once a 4 day). Couldn't say it was particular tail #'s, but did seem to happen during descents and in warmer climates (perhaps low power/high stage bleed air?).

With thousands of pilots flying these planes (just at our airline) you'd think there'd be greater instances of illness. Perhaps it manifests as a longer term chronic issue and only is acute in some people. Did I feel like crap sometimes, yes. Was it from the air or flying 5 legs over 13 hours? Who knows.

I do get regular annual physicals outside of work. Not sure if any of this would manifest in routine blood work. Would this be something the union could organize by getting a large enough sample of pilots (volunteers) to submit to physicals specifically related to engine oil toxicity.