If everything is working properly, the oil pressure gauge fluctuates … because it’s supposed to! When the engine oil is cold, it’s thicker, so the gauge will show higher pressure at a given RPM. As the engine warms up, so does the oil, and it becomes a bit thinner, so the oil pressure gauge reads a bit lower.Click to see full answer. Keeping this in consideration, is it normal for your oil pressure gauge to fluctuate?There are rare mechanical problems that can cause an unsteady oil pressure reading. They usually happen right after an engine has been overhauled. If that sounds like you, then suspect a faulty oil pressure by-pass valve or spring inside the oil pump. Valves stick or can get installed wrong on some engines.Also, is your oil pressure gauge supposed to move? This is normal operation for your oil pressure. The faster the motor spins, (RPM, revolutions per minute) the faster the oil pump spins creating higher oil pressure. Keep in mind, most gauges aren’t accurate. The only way to get an accurate reading is with a quality oil pressure tester. Similarly one may ask, why does my oil pressure gauge keep dropping? In the event that the oil pressure drops as the engine warms up, you need to pay attention to the oil pump and pressure relief valve. This can lead to oil pressure dropping as the engine warms up. Other causes of low engine oil pressure are worn-out crankshaft and bearings.Why does oil pressure rise and fall? Dirty Oil Filter Overtime, dust and other particles start clogging the filter, and when this happens, the oil starts flowing at a slower rate, and this, in turn, causes the temperature to rise. An increase in temperature will then trigger a rise in oil pressure.
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