I remember that the limited slip differentials used a sperm whale oil. I found this on Mobil's web site:
The oil must be able to withstand the shocks and loads created by the transfer of engine horsepower and torque to the wheels
Right up until commercial whaling was largely outlawed in the 1970s, a major component of this high-pressure lubricant came from sperm whales. These compounds have since been replaced with more modern manufactured equivalents.