We just learned about the Coolant Passages.
Some other parts of a car's engine are called the Oil Galleries.
Oil in the engine helps things run smoothly, so that the metal parts don't grind against each other.
There are holes for oil that go like tunnels all through the engine block, carrying the oil around to keep everything slippery and smooth.
(from: wikipedia - engine block)
Kid Facts - Blast from the past: Negative Feedback
