Correct answer
The oil pressure in the pipes
It indicates oil pressure in the lubrication circuit. It does not directly measure sump level or oil quantity. Acceptable values depend on the engine and checking conditions, such as speed and temperature; compare them with manufacturer specifications. Abnormal pressure may have different causes and does not alone identify a specific fault. Follow the manual’s instructions for low-pressure warnings.
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The oil pressure in the pipes
The amount of oil in the sump.
The oil level.
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