When water gets into engine oil, it creates a milky, mayonnaise-like appearance that mechanics call "milk shake oil." This happens because oil additives act like soap, suspending tiny water droplets throughout the oil in what chemists call an emulsion. Even a small amount of water contamination can drastically reduce oil's ability to protect engine parts, which is why checking for this milky color on the dipstick is a crucial maintenance step. The most common causes are condensation from short trips, leaking head gaskets, or damaged coolers.
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