Jet-turbine oil contains Tri-Cresyl Phosphate as a stabilizing additive. The problem: it acts like other organophosphates....it’s a nerve-agent.
If the front bearing-seals leak in a jet engine, that oil will be compressed with the air, turning to vapor, and delivered via normal bleed to the Packs...and the cabin.
The best solution would be to find a substitute additive that is not a nerve agent. Because stopping ALL oil leaks is mechanically impossible.
But it may be there is no other alternative.