I recently bought a 2006 Freightliner M2 with 53,000 miles. It runs and looks great, as it should. Under load towing, the oil pressure runs right at 40 psi. My son's M2 with over 300,000 miles stays near 50, also a Cat C7. My other M2 with a Mercedes also stays right at 50. Should my lower pressure be a concern? Hot idle is just under 25 psi. Are the senders or gauges known to be inaccurate? If I were to install a mechanical gauge, does anyone know where to tap into? Thanks


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ziggyhFull MemberPosts: 248
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The oil pressure sensor is located just to to the left of the ECU and the right of the slobber tube. You can tee a mechanical gauge at that point to compare you pressure. I don't know the exact spec for your engine serial, but I seem to recall minimum spec at hot idle is around 6 psi.Your engine will set a DTC for low and very low oil pressure and should shut down to protect the engineI have attached a sensor location for the c7 and oil pressure charts from my c9 which will be similar to your c7 for a comparichild
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DaleJr. MemberPosts: 56It's about Life
And now for the real story.Oil pressure is controlled by a Injection actuator pressure sensor and valve.Oil pressure goes as high as 3000 psi. This oil pressure controls the fuel injectors fuel flow. The engine computer controls and regulates this do to the fuel schedules programmed.The computer will shut down the engine due to oil, low oil, low pressure.Now for the really good stuff, the oil gauge on the dash? Is an option, and not normally installed. So why is it there? For warm and fuzzies for us guys. enjoy


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