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I looked at info for 1500--5.7L engine. 6 psi @ 1000 rpms 18 psi@2000 rpms 24 psi @ 4000 rpms
Sometimes, you can use analog gage in place of oil pressure sending unit and double check oil pressure that way. If oil pressure is actually low, if high mileage engine, I doubt replacing oil pump will help. I just wanted to add, check oil pressure engine warmed up.
First check the oil level and make sure it is full.
Sounds like your Oil Sending Sensor is Failing. What happens when it fails is the oil pressure drops and the light goes on. You can test it by pulling the sensor and putting a gauge on it. If you have 6 PSI or better in park and 55+psi in gear then it is good. When the pressure drops so to does the circulation. Drive it to long like that and you risk seizing your engine. Replace that sensor immediately if the pressure is not as it should be.
This can also be a weak oil pump.
I recommend checking in the order I listed. It is more than likely one of them.
What engine in your Durango? Most likely you have debris on your oil pan clogging the pickup screen, or a failing pump. Be sure to verify with a mechanical pressure gage that oil pressure is indeed dropping before you take oil pan off.
May be bad oil pressure sending unit. Best way to check is to connect a mechanical oil pressure guage to engine and check pressures when engine is warm. Should be no lower than 40 psi at idle when warm, no higher than 70 psi at 2000 rpm.
Hello daebbers: My name is Roger and I will be glad to help you. I assume by the way your question is written you have no objectionable engine noise. I would suspect a bad oil pressure sending unit. To check the switch will require a mechanical oil presser test. You can buy a kit at any parts store. With a cold engine. Remove the oil switch from the block. Install the mechanical gauge. after all connections are tight start the engine. Note where the pressure is at. Observe the pressure through engine warm up. As the oil and engine warm up the oil pressure will drop. According to All Data information the oil pressure at curb idle is 6 psi. This would be a min. oil pressure. If the oil pressure is higher then that is great also. Any thing less you have a internal oil leak. This would likely be a bearing issue.
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You definitely need to put a mechanical gauge on there and check for ACTUAL oil pressure. It is possible that the passageway to the sending unit may be plugged with gunk. If oil pressure is not correct or if in doubt, do not drive it 'till you know for sure what's going on in there. No noises tells me that it is likely not serious but an engine is just too expensive to gamble!!!
Locate your oil pressure sending sensor... generally near the oil filter intake but not always... give it a spray of WD40 to repel any water on it. next have the oil pressure tested just to be certain. the relay for the sending unit may need to be replaced as well... it's located likely in the fuse box in the engine compartment near the battery.
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