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Oil Guage Fluctuations The oil guage indicates the lubricating oil pressure in the engine. Unless the sensor, guage, or its electrical circuit are defective, the drop and rise indicated by the guage are showing lowering and rising of the engine oil pressure. These fluctuations could be related to changes in engine RPM [revolutions per minute], or defects in the guaging system.

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Q: Why does oil gauge drop and go back up?
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