Re: Volvo oil pressure
Paul,toggle quoted messageShow quoted text
It is a bit curious that this problem arose after your oil change. I wonder if the viscosity of the oil that was used for the change was lower than the original oil in the engine before the change? Maybe you bought the correct oil the oil added was mislabeled or thinner than indicated? Maybe try another oil change, possibly with a different respected brand to eliminate that variable.
Cooling issues could also cause lower oil pressure by thinning the oil, does the engine seem to be warmer than normal?
Oil pressure relief valves can stick freeze closed due to corrosion if moisture gets into the oil pan, I have personal experience with that one. I have never seen one stick open which could cause low oil pressure but maybe..
Did your engineer record normal oil pressure with the engine warm and the RPM up to the recommended level? I would be more concerned about the higher rpm reading than the idle.
Best of luck,