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Old 08-05-2014, 07:24 PM   #1
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Oil Pressure 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?
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Old 08-05-2014, 09:39 PM   #2
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Engines I have been around vary somewhat in oil pressure. Cold thick oil vs. hot thin oil and different engine RPMs should effect engine oil pressure.
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Old 08-05-2014, 09:41 PM   #3
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Doesn't sound right to me. My varies more than that depending on if the engine is cold or hot or at idle or at cruising speed.
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Old 08-05-2014, 10:56 PM   #4
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My cat cold will hit almost 100. Warm will vary between 28-60. Something ain't right sir.
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Old 08-05-2014, 11:45 PM   #5
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i verified with cummins and my isc does it... when cold or accelerating, it's 75 psi; when cruising on a flat road, it's 50; when idle, it's 25.
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Old 08-05-2014, 11:53 PM   #6
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If this is a electric gauge, then it's really no better than a idiot light.

install a REAL Mechanical gauge to see what you really have.
I'd be very surprised to see it that low.
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