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corruption. its use in aviation - and use of other chemicals involved in their engines - is not safe at all either -

https://www.latimes.com/projects/toxic-chemicals-planes-covi...

https://www.bbc.com/news/stories-51633897

oil-in-cabin-air issues are solved by not using bleed air for cabin pressurization.

I think that has problems which prohibit it from being implemented. I think a better option to just pass the air through a filter to remove oil particles before the air is used in the cabin.

IIRC it's not particles, but combustion/decomposition products.

And no, it's not an issue with using non-engine air for cabin pressurization taking too much weight/power: even a large airplane needs only little actual airflow.

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