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Oil is used to lubricate the engine and some is splashed on the cylinder wall and pistions to lubricate those also!

But while that is happening, some oil gets past the pistons and into the combustion chamber were is is burnt along with the fuel.

Only a minute quantity is lost, but the more you run your car, the more oil gets lost, so you have to top-up the oil before it gets to the empty level.

Also, black soot from the burnt fuel get past the pistons in the opposite direction, which is why new oil changes from being yellow in colour to black.

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15y ago

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