For the first time since I have had the car (a few days and ~250 miles) the oil pressure dropped to nil on the gauge coupled with the oil pressure warning light at idle. As soon as the car accelerates the pressure shoots back up to the normal range on the gauge and will stay there until coming to a full stop. I checked with the previous owner and he stated that the car would do this to him periodically but he always just checked the oil, which was always fine, and had the engine inspected for any leaks and found none. I drove the car about 30 miles today without this issue, but on my work commute 2 blocks, it started.

Oil being run is 5W30 synthetic per spec. Oil level is fine, no leaks. There is absolutely no pressure issue while driving and there are no abnormal sounds from the engine. From what I can gather it will either be: a) oil pressure sensor, b) oil pressure relief valve, or c) oil pump.

I tend to not think the oil pump as the engine makes no knocking or rattling sounds while having the indicated zero pressure. Accelerates fine, runs fine.

The oil temperature was showing less than normal during this incident and the coolant temperature never increased from normal. The ambient temperature was about 95 degrees.

I will pickup the sensor from the dealer tomorrow morning and put it in and go from there, but what are some thoughts? I have never had this issue with our other R53 MCS.

 

I unplugged the sensor and there is oil on the electrical contacts, so oil is leaking out of the sensor. Failed sensor. Should be an easy fix. Oil pressure reading normal currently.

 

My girls car had the same issue. Turned out the idiot at the dealership used the wrong oil filter. It was to small and messed with the pressure causing the light