What should it be for a gmc sierra 1500 5.3 liter it runs at a little under 40 whe it warms up it drops to about 25 to 30 at an idle engine has 42000 miles
If you are using the gauge that came with the vehicle it's accuracy is not great. These gauges were designed so that at a glance you can see the needle is pointing basically to the middle of the dial. As long as the needle is more od less there, you're okay but the numbers mean nothing due to the gauges in accuracy. If you really want to check the oil pressure, the procedure is pretty easy but requires decent equipment as well as the knowledge of where to tap into the pressurized oil system.
If you are talking about oil pressure that would be in the normal range. Hope this helps.
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