I'm trying to find what the oil press should be around while driving 65mph in 6th @2000 RPM. This morning mine was around 70 and I thought that was a little high. I want to say I recalled it being around 40-50 last week. Ideas?

 

Shop manual says 30PSI is normal @ cruising speeds. Mine is @ 40-45PSI. At idle it is @ 20PSI. In the morning it will ride @ 70 PSI, and tehn once the oil warms up, it comes back down.


And since your truck is new, you can expect a little higher until it gets broke in some as well.

 

They fooled another one....

The factory dash gauge is a dummy gauge that is commanded by the ECM.

The actual engine has no pressure reader/sensor....starting in late 01 model year the Cummins for Dodge started to get a pressure switch in place of a sensor.
The switch basically tells the ECM that the engine has 7 psi (IIRC) and for the ECM thats good. Then the ECM controls the movement of the gauge on the dash to mimmick real sensor conditions....

 

Ditto!

I had the truck in to the dealer a few weeks ago for low oil pressure....their response, paraphrased, was that the dash gauge is a calculated value. And no mention of the Autometer gauge on the a-pillar.

On the Autometer gauge, I am reading 55-60 psi at 2000rpm (70mph cruise), depending upon ambient temperature and ~10-12psi hot idle, again depending upon ambient temperature. If I cool the turbo down at high idle for ~5-10 minutes, I can get the oil pressure to increase (hot idle) by ~2psi to ~12-14psi. I feel better seeing closer to 14psi at idle.

HTH

Tony

 

Then I won't worry about it. Thanks for the input.

 

That they did

 

That means i got fooled too. If it dont work why have it?

 

My thinking as well. Especially one with numbers makes no sense. What is the purpose? There is none. Might as well thrown an idiot light on the dash whn you have low or no oil pressure, instead of a gauge with numbers that fluctuates. Seems odd tha itstarts at 70+, moves down to 30 @ cruising, 20 @ idle, moves back up when you sep on teh throttle. If the gauge doesn't work, then what is it doing?

It was said that it mimick's real sensor conditions, isn't that the same thing? It IS measuring oil pressure than, right?

 

No, its not a sensor. Dodge just took data that they knew to be common with a 5.9's oil pressure readings and they basically give you an "estimate" of pressure for the conditions given (ie rpm, temp, etc.).

01 and pre had a real sensor that would actually give a range of readings not just an "on/off" reading aka pressure switch.

Dont take my word for it...

 

Interesting, sounds like a good excuse for getting another gauge, what else should I put into he clumn mount I wonder...