|I have fitted a combined engine oil pressure and temperature gauge to my M3W with the following results.
Start up from cold:-
Temperature of oil is the same as the ambient air temperature (as you would expect).
Oil pressure at tick over is around 60 to 70 psi. and only goes slightly over that when the engine is revved. I dont know if there is some form of pressure relief valve that limits the upper oil pressure.
Normal running:-
Temperature of oil normally between 75°C and 85°C (obviously again dependant on ambient air tremperature).
At this temperature the oil pressure at around 3000 rpm is 50 to 55 psi. At tick over this drops to approximately 25 psi.
Stuck in traffic:-
I have seen the oil temperature go as high as 112°C but skip fire has still not cut in.
At this temperature the oil pressure goes down to around 17 to 22 psi. at tick over and 40 to 45 psi at around 3000 rpm.
I don't know if mine is typical but I hope this is of some help.
Keith
