Oil Pressure Question

Question

We have 1999 Monaco Diplomat with the 5.9 ISB engine and it has 35,000 miles on it, bought it 7 years ago with 24,000 miles and the oil pressure has always read between 20-25 psi on the gauge weather hot or cold, at idle or driving 60 mph (gauge. is 0-80 psi)

I have never really worried about it to much, but was changing the oil and started wondering about it again. Could this be a sending unit problem?

john_wayne · Answer

Read you post 3 times I'm confused what are you asking? Has the oil pressure changed if so to what? or is it still reading 20-25 psi. if so I see no problem. The gauge could be no more then taking the place of  an idiot light. And read that way till oil pressure is lost or get below set pressure. Only way to really know is "T" in a mechanical gauge.

jocat54 · Answer

Sorry if I wasn't clear, the guage still reads the same at 20-25 psi.

a1machinist · Answer

I'd t in another known working gauge.  Oil preassure should fluctuate abit and find out what standard operating preassure is.  May be right in spec and only fluctuate 5lbs which would be fine.

powderman426 · Answer

Of you go to a Cummin's forum you will find that on the trucks the oil pressure reading is controlled by the computer and is a made up number to make the owner feel good as the 5.9 engines don't have a very high oil pressure. I imagine that engine is the same and wouldn't worry about it.

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Oil Pressure Question

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