What type of oil is in old ignition coils?

What type of oil is in old ignition coils?
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Answer :

They would contain transformer oil if they have an oilfilling.Old transformer oil (made before 1979) included PCBs as a fireretardent. PCBs have been found to cause many health problemsincluding cancers and are now banned from transformer oils.
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What type of oil is in old ignition coils?

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