What Causes Low Oil Pressure at Idle Speed?

1 Answers
DelBrady
07/30/25 5:42am
The reasons for low oil pressure at idle speed include: Malfunctioning oil pump: Insufficient oil level in the crankcase. The oil does not meet the required specifications, with viscosity being too low, meaning the oil is too thin. Effects of overly thin oil: The oil fails to meet specifications due to excessively low viscosity, or the oil level in the crankcase is too low. When the engine is idling, if the oil pressure is too low, it can lead to semi-dry or dry friction between the surfaces of moving parts, accelerating wear and tear, increasing clearance between components, and even causing bearing alloy to melt or peel off, resulting in abnormal noises. Introduction to engine idle: The oil pressure gauge reading during engine idle represents the idle working pressure of the fuel supply system, typically 0.25MPa or as specified by the vehicle's technical requirements. When testing idle working pressure, removing the vacuum tube from the fuel pressure regulator should cause the oil pressure to rise to 0.3MPa; otherwise, the oil pressure regulator should be replaced.
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