Motor oil

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  Oil-puddle in the rain
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  Bubbles on used engine oil
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  Dipstick used to measure the level of motor oil in an automobile.
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  Dipstick showing oil level.
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  An oil filter.
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  Draining motor oil from an automobile as part of an oil change.
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  An oil filter wrench, used to replace the oil filter.
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  Using a funnel to refill the motor oil after an oil change.
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