Aerated oil can be compressed, which can result in collapsed hydraulic lifters, or even a broken crankshaft.

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Quizplus · Accepted Answer

Aerated oil, which contains air bubbles, can indeed be compressed unlike pure hydraulic oil. This compressibility can lead to insufficient hydraulic pressure in systems like lifters, potentially causing them to collapse. In extreme cases, the reduced lubrication and altered pressure dynamics can also contribute to a broken crankshaft due to increased friction and mechanical stress.

Aerated Oil Can Be Compressed, Which Can Result in Collapsed