What is a good analogy for an oil change.?

I have to give a speech on how to change your own oil. We have to have a metaphor or analogy to go along with the speech. The metaphor is supposed to help the audience understand an oil change. I am having trouble coming up with ideas. Any help would be greatly appreciated.What is a good analogy for an oil change.?as in people drinking water. out with the fouled water and in with new water to keep the body working in its best condition. replace old fluids to keep the parts working efficiently.

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