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When the oil is cold the pump has lots of preasure . When it warms it drops at idle but depends on the rpm of the engine. It sounds like it is operating correctly other than the preasure may be showing a little high. If you want to know the correct preasure have a manual gauge installed.

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โˆ™ 2004-09-14 10:14:38
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Q: Why does the oil pressure gauge on a 1976 Chevy three-quarter ton go to the top when starting then go down a little?
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