Hello. I have a 1994 Cadillac DeVille Concourse that has a low oil pressure problem. I got the message in the information center that said "Low Oil Pressure, Stop Engine". I had the oil pump replaced and the pressure momentarily went up to 40 psi and then dropped to 12-14 psi again. It also has an audible ticking noise. Has anyone had this problem? If so, what did you do to fix it? I've been told that I may have to replace the engine.