Haha that's amazing! Hopefully the pilots weren't too phased. Thanks for sharing
Did some further digging and it looks like it does have a tendency to gum. From wikipedia, "The viscosity of castor oil at 10 °C is 2,420 centipoise,[28] but it tends to form gums in a short time, so its usefulness is limited to engines that are regularly rebuilt, such as racing engines. Lubricant company Castrol took its name from castor oil."
Did some further digging and it looks like it does have a tendency to gum. From wikipedia, "The viscosity of castor oil at 10 °C is 2,420 centipoise,[28] but it tends to form gums in a short time, so its usefulness is limited to engines that are regularly rebuilt, such as racing engines. Lubricant company Castrol took its name from castor oil."
https://en.wikipedia.org/wiki/Castor_oil#Lubrication