Ibought '01 S60, after minutes of driving,warning no oil pressure- car has 49k,I have oil pan off now,previuos sludge in now cleaned pan. My buddy @ dealership saod to replace o-rings in pan and pick-up tube. I think someone already tried that and was not successful. Should I go deeper(oil pump,maybe stopped up oil cooler) or any suggestions? Richard

 

Did you see any problems with the o-rings at all?
Did you also look at the one on the pipe inside the pan?
Check all of them really good.Your car should have 5 total.