I just purchased a 1999 996 (49K miles) and have a question about the normal oil pressure. I read in the operating manual that normal oil pressure is 3.5 bar at 3000 RPM. For my car, it runs about 2.5 bar at idle (800rpm) and reaches 5 bar at about 2600-2800 RPM. When running highway speed and >2800 RPM, oil pressure is 5 to over max scale (>5). Oil is Mobil 1 installed by Porsche dealer about 5000 miles ago (and 2 years ago). When seen, is this "normal", indicating a blockage (ie. oil filter), bad sensor, other. Any way to diagnose?