oil dilution

oil dilution

A method of treating the lubricating oil to make it possible to start a reciprocating engine when the temperature is very low. When the oil gets cold, it becomes thick and hard to move, making it difficult for the starter to turn the engine over fast enough for it to start.

Before shutting the engine down, enough gasoline from the fuel system is mixed with the lubricating oil to dilute it, so the starter can turn the engine over when the oil is cold. When the engine starts and the oil warms up, the gasoline evaporates from it. The oil is not damaged by diluting it.

Oil dilution is no longer needed because multiviscosity oil is thin enough at low temperature to allow the engine to start.

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Category: Aeronautics
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