We just learned about the Timing Belt.
Another part of how a car works is Motor Oil.
When all the parts of a metal car engine are moving around, things can get very hot.
If you've ever heard metal scraping on metal, you know that two pieces of metal don't slide against each other smoothly.
To make the engine parts move smooth and not scrape against each other, cars use a slippery oil that lets helps things move around quickly without problems.
We learned before about the holes in the main engine called oil galleries.
That is where the motor oil goes, and it goes through all those holes to get to parts like the camshaft and crankshaft that need oil as they move around.
After a while the oil gets dirty from being used, so the oil has to be emptied out of a car and replaced with fresh oil.
(from: wikipedia - motor oil)
Kid Facts - Blast from the past: Vacuum Pump
