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Re: DIY - discussion on building a DIY hookah diving compressor
My limited understanding is that all of the modern "oil-less" compressors are in fact oil free (except possibly manufacturing/machining traces) because they use teflon rings instead of oiled ones. And that is why the small tire-inflator types easily overheat and burn out, from the teflon melting if they are run too long.
Not a question of oil type of quality, just a different piece of equipment that simply does not use oil at all, so it can't contaminate the airflow.
Assuming it has properly cleaned of manufacturing traces during assembly.