Why Does Engine Oil Emulsify?

1 Answers
AbigailAnn
07/29/25 5:00pm
Engine oil emulsification occurs due to the following reasons: 1. Possible issues with the engine's internal water channels, such as aging or poor sealing of the engine cylinder gasket, allowing engine coolant to mix with the oil; damage to the engine oil cooler leading to coolant entering the oil; or driving through deep puddles in summer, where water enters the engine through the crankcase ventilation pipe or air filter duct. 2. Prolonged failure to change the oil (the shelf life of unsealed oil is 1.5 years); poor engine performance due to design flaws causing oil emulsification; or during cold starts, some unburned gasoline seeping into the oil through the piston rings, leading to oil degradation, emulsification, and even increased volume over time.
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