Blue whale skeleton at New Bedford museum still oozing oil

Ok I'm going to come out and say it because I think multiple people in this thread have hinted at the same confusion: What bloody kind of oil are we talking about here? Whale oil, that somehow was captured in the bones? Petroleum oil from the whale's encounter with the tanker? They basically buried the lede on this story and nowhere appear to explain why this particular whale is dripping some kind of "oil" that seemingly other museum example don't experience. So - anyone got any insight here?

It's rather obvious that it's whale oil, given that whales used to be hunted for their oil. I don't know how you could even assume that a whale skeleton would drip petroleum.

Funny anecdote: The automatic transmission used to be lubricated with whale oil because it (whale oil) could handle higher temperatures than petroleum based lubricants. It was banning whaling in the 20th century that lead to developing petroleum-based high-heat lubricants.