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In a car transmission, the transmission can vary forms or even quantities in cars...a minivan might have 2 transmission while a small car might have 1..the transmission uses a different type of oil from the engine oil..even though you need a car transmission and a car engine to work the car, they use different oils and work a little differently.
The circular thing thats in the center of the picture is a car transmission

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This here is where the engine goes...be careful if you doing this type of work because if you don't disconnect a sensor properly you might mess up the engine...in the picture the circular/cylinder that is not really showing is a car transmission...

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This right hear is an important part of a car...without a car engine where can you go?...there are many parts in a car engine...where I work at, so far I've changed 7 things in a car engine and 6 parts in a diesel engine

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The oil pan a rectangular container where it has a bolt. The bolt is their so that when you want to do a oil change, (because cars needs oil change every certain amount of miles), you  Loosen the bolt and the oil will come out.

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The whitish cylinder shape is a oil filler.
The oil filter helps remove contaminants from your car engine's oil that can accumulate over time as the oil keeps your engine clean. Clean motor oil is important because if the oil were left unfiltered for a period of time, it could become saturated with tiny, hard particles that can wear surfaces in your engine.