Strange oil pressure guage reading on my friends S320. Oil pressure guage behaves as it should when the car is off and you start it. Zeros out, and doesn't rise until the engine starts ect. Seems normal, pegs at 3 bar. The problem is it is always pegged at 3 bar. Once in awhile it migh come down to like 2.75ish a bit, but usualy its always at 3.
What gives? Sensor issue? Car runs fine, Mobil 1 0w40 in the crank with an OE filter. He isn't running 90w gear oil in the thing!
I'm used to it resting somewhere between 1 and 2 bar at hot idle, any reason I shouldn't expect this out of a 78k mile M104?